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Deck 22: Magnetism
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FIGURE 22-4 
When the switch is closed in the circuit shown in the sketch in Figure 22-4, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is
A) not contributing to the wire's deflection.
B) a north magnetic pole.
C) a south magnetic pole.
D) a magnetic monopole.
E) a magnetic dipole.
When the switch is closed in the circuit shown in the sketch in Figure 22-4, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is
A) not contributing to the wire's deflection.
B) a north magnetic pole.
C) a south magnetic pole.
D) a magnetic monopole.
E) a magnetic dipole.
Question
FIGURE 22-1 
Three particles travel through a region of space where the magnetic field is out of the page, as shown in Figure 22-1. The electric charge of each of the three particles is, respectively,
A) 1 is neutral, 2 is negative, and 3 is positive.
B) 1 is neutral, 2 is positive, and 3 is negative.
C) 1 is positive, 2 is neutral, and 3 is negative.
D) 1 is positive, 2 is negative, and 3 is neutral.
E) 1 is negative, 2 is neutral, and 3 is positive.
Three particles travel through a region of space where the magnetic field is out of the page, as shown in Figure 22-1. The electric charge of each of the three particles is, respectively,
A) 1 is neutral, 2 is negative, and 3 is positive.
B) 1 is neutral, 2 is positive, and 3 is negative.
C) 1 is positive, 2 is neutral, and 3 is negative.
D) 1 is positive, 2 is negative, and 3 is neutral.
E) 1 is negative, 2 is neutral, and 3 is positive.
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FIGURE 22-5 
A metal bar of mass m and length L is suspended from two conducting wires, as shown in the sketch in Figure 22-5. A uniform magnetic field
points vertically downward. Choose the expression that best describes the condition satisfied by the angle θ that the suspending wires make with the vertical when the bar carries a current I.
A)
B)
C)
D)
E)
A metal bar of mass m and length L is suspended from two conducting wires, as shown in the sketch in Figure 22-5. A uniform magnetic field
points vertically downward. Choose the expression that best describes the condition satisfied by the angle θ that the suspending wires make with the vertical when the bar carries a current I.A)
B)
C)
D)
E)
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FIGURE 22-3 
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section AB of this coil?
A) ILB sinθ
B) ILB cos θ
C) ILB
D) 0 N
E) ILB/2
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section AB of this coil?
A) ILB sinθ
B) ILB cos θ
C) ILB
D) 0 N
E) ILB/2
Question
FIGURE 22-3
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section BC of this coil?
A) ILB/2
B) 0 N
C) ILB sinθ
D) ILB cos θ
E) ILB
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section BC of this coil?
A) ILB/2
B) 0 N
C) ILB sinθ
D) ILB cos θ
E) ILB
Question
FIGURE 22-3
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the direction of the force acting on section CD of this coil?
A) perpendicular to and into the page
B) perpendicular to and out of the page
C) in the direction of the magnetic field
D) in the opposite direction of the magnetic field
E) none
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the direction of the force acting on section CD of this coil?
A) perpendicular to and into the page
B) perpendicular to and out of the page
C) in the direction of the magnetic field
D) in the opposite direction of the magnetic field
E) none
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FIGURE 22-6 
A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the sketch in Figure 22-6. The current in the wire points to the right and is of magnitude I. In which direction must current flow in the loop to produce zero magnetic field at its center?
A) counterclockwise
B) clockwise
C) It is indifferent if clockwise or counterclockwise.
D) The current in the loop should be zero A.
A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the sketch in Figure 22-6. The current in the wire points to the right and is of magnitude I. In which direction must current flow in the loop to produce zero magnetic field at its center?
A) counterclockwise
B) clockwise
C) It is indifferent if clockwise or counterclockwise.
D) The current in the loop should be zero A.
Question
FIGURE 22-2 
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-2. If there is no current flowing through the coil, what is the force acting on section AB of the coil?
A) ILB sinθ
B) ILB cos θ
C) ILB
D) 0 N
E) None of the other answers is correct.
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-2. If there is no current flowing through the coil, what is the force acting on section AB of the coil?
A) ILB sinθ
B) ILB cos θ
C) ILB
D) 0 N
E) None of the other answers is correct.
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FIGURE 22-3
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the direction of the force acting on section AB of this coil?
A) perpendicular to and into the page
B) perpendicular to and out of the page
C) in the direction of the magnetic field
D) in the opposite direction of the magnetic field
E) none
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the direction of the force acting on section AB of this coil?
A) perpendicular to and into the page
B) perpendicular to and out of the page
C) in the direction of the magnetic field
D) in the opposite direction of the magnetic field
E) none
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FIGURE 22-7 
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.55 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section CD of this wire?
A) 0.070 N perpendicular into the page
B) 0.40 N perpendicular out of the page
C) 0.070 N perpendicular out of the page
D) 0.40 N perpendicular into the page
E) 0.20 N perpendicular out of the page
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.55 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section CD of this wire?
A) 0.070 N perpendicular into the page
B) 0.40 N perpendicular out of the page
C) 0.070 N perpendicular out of the page
D) 0.40 N perpendicular into the page
E) 0.20 N perpendicular out of the page
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FIGURE 22-8 
A rectangular loop of wire carrying a 4.0-A current and with certain dimensions is placed in a magnetic field of 0.60 T. The magnitude of the torque acting on this wire when it makes a 60° angle with the field is 1.1 Nm. What is the area of this wire?
A) 0.20 m2
B) 0.40 m2
C) 0.26 m2
D) 0.80 m2
E) 0.53 m2
A rectangular loop of wire carrying a 4.0-A current and with certain dimensions is placed in a magnetic field of 0.60 T. The magnitude of the torque acting on this wire when it makes a 60° angle with the field is 1.1 Nm. What is the area of this wire?
A) 0.20 m2
B) 0.40 m2
C) 0.26 m2
D) 0.80 m2
E) 0.53 m2
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FIGURE 22-7
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on the wire?
A) 0.40 N perpendicular out of the page
B) 0.10 N perpendicular into the page
C) 0.40 N perpendicular into the page
D) 0.10 N perpendicular out of the page
E) 0.20 N perpendicular out of the page
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on the wire?
A) 0.40 N perpendicular out of the page
B) 0.10 N perpendicular into the page
C) 0.40 N perpendicular into the page
D) 0.10 N perpendicular out of the page
E) 0.20 N perpendicular out of the page
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FIGURE 22-7
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.65 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section BC of this wire?
A) 0 N
B) 0.090 N perpendicular out of the page
C) 0.090 N perpendicular into the page
D) 0.060 N perpendicular out of the page
E) none of the above
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.65 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section BC of this wire?
A) 0 N
B) 0.090 N perpendicular out of the page
C) 0.090 N perpendicular into the page
D) 0.060 N perpendicular out of the page
E) none of the above
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FIGURE 22-8
A rectangular loop of wire, with dimensions shown in Figure 22-8, carries a current of 2 A and is placed in a magnetic field of 0.8 T. The wire rotates in the magnetic field and at one point it is perpendicular to the magnetic field. What is the magnitude of the torque acting on the wire?
A) 0 Nm
B) 1 Nm
C) 2 Nm
D) 3 Nm
E) 4 Nm
A rectangular loop of wire, with dimensions shown in Figure 22-8, carries a current of 2 A and is placed in a magnetic field of 0.8 T. The wire rotates in the magnetic field and at one point it is perpendicular to the magnetic field. What is the magnitude of the torque acting on the wire?
A) 0 Nm
B) 1 Nm
C) 2 Nm
D) 3 Nm
E) 4 Nm
Question
FIGURE 22-7
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right side of Figure 22-7. The figure indicates the dimensions of the wire. What is the magnitude and direction of the force acting on section AB of this wire?
A) 0.20 N perpendicular out of the page
B) 0.40 N perpendicular out of the page
C) 0.11 N perpendicular out of the page
D) 0.20 N perpendicular into the page
E) 0.11 N perpendicular into the page
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right side of Figure 22-7. The figure indicates the dimensions of the wire. What is the magnitude and direction of the force acting on section AB of this wire?
A) 0.20 N perpendicular out of the page
B) 0.40 N perpendicular out of the page
C) 0.11 N perpendicular out of the page
D) 0.20 N perpendicular into the page
E) 0.11 N perpendicular into the page
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FIGURE 22-7
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section DE of this wire?
A) 0.30 N perpendicular out of the page
B) 0.12 N perpendicular into the page
C) 0.30 N perpendicular into the page
D) 0.12 N perpendicular out of the page
E) 0.20 N perpendicular out of the page
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section DE of this wire?
A) 0.30 N perpendicular out of the page
B) 0.12 N perpendicular into the page
C) 0.30 N perpendicular into the page
D) 0.12 N perpendicular out of the page
E) 0.20 N perpendicular out of the page
Question
FIGURE 22-8
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetic field?
A) zero
B) 0.41 m ∙ N
C) 0.47 m ∙ N
D) 0.52 m ∙ N
E) 0.58 m ∙ N
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetic field?
A) zero
B) 0.41 m ∙ N
C) 0.47 m ∙ N
D) 0.52 m ∙ N
E) 0.58 m ∙ N
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FIGURE 22-8
A rectangular loop of wire, with dimensions as shown in Figure 22-8, carrying a 2-A current is placed in a magnetic field of 0.8 T. The loop rotates in the magnetic field and at one point makes a 30° angle with the magnetic field. What is the magnitude of the torque acting on the wire?
A) 0.3 Nm
B) 0.4 Nm
C) 0.5 Nm
D) 0.6 Nm
E) 0.7 Nm
A rectangular loop of wire, with dimensions as shown in Figure 22-8, carrying a 2-A current is placed in a magnetic field of 0.8 T. The loop rotates in the magnetic field and at one point makes a 30° angle with the magnetic field. What is the magnitude of the torque acting on the wire?
A) 0.3 Nm
B) 0.4 Nm
C) 0.5 Nm
D) 0.6 Nm
E) 0.7 Nm
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Deck 22: Magnetism
1
The field near a long straight wire carrying a current is inversely proportional to the current flowing through the wire.
False
2
A rectangular coil carrying a current in a magnetic field will experience a net torque that will cause the coil to rotate in that field, if the field is not along the coil axis.
True
3
Describe ferromagnetism.
A ferromagnetic material produces a magnetic field even in the absence of an external magnetic field.Permanent magnets are constructed of ferromagnetic materials.
4
An electron moving along the +x-axis enters a magnetic field. If the electron experiences a magnetic deflection in the -y direction, what is the direction of the magnetic field in this region?
A) along the +z-axis
B) along the -z-axis
C) along the -x-axis
D) along the +y-axis
E) along the -y-axis
A) along the +z-axis
B) along the -z-axis
C) along the -x-axis
D) along the +y-axis
E) along the -y-axis
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5
For any displacement of a charged particle, the work done by the magnetic force on the charged particle moving in a magnetic field is zero J.
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6
Describe diamagnetism.
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7
An electric field makes a charged particle accelerate but a magnetic field takes it around in a circle.
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8
A wire carrying a current that placed in a magnetic field will experience a maximum force if the angle between the direction of the current and the direction of the magnetic field is 60°.
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9
The magnetic field unlike the electric field is continuous.
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10
A charged particle traveling opposite to a magnetic field does not experience a magnetic force.
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11
A current carrying wire placed in a magnetic field perpendicular to the wire experiences a maximum force.
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12
If two identical wires carrying a certain current in the same direction are placed parallel to each other, they will experience a force of repulsion.
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13
Magnetic field lines can never cross one another.
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14
The magnetic field near a current carrying wire is directly proportional to the distance from the wire.
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15
Describe paramagnetism
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16
At a given location the direction of the magnetic field is the direction that the north pole of a compass points when placed at that location.
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17
Which of the following statements is correct?
A) Earth's geographic north pole is the north pole of the Earth's magnetic field.
B) Earth's geographic south pole is the south pole of the Earth's magnetic field.
C) The north pole of a magnet points towards the Earth's geographic north pole.
D) The north pole of a magnet points towards the Earth's geographic south pole.
E) None of the above statements is correct..
A) Earth's geographic north pole is the north pole of the Earth's magnetic field.
B) Earth's geographic south pole is the south pole of the Earth's magnetic field.
C) The north pole of a magnet points towards the Earth's geographic north pole.
D) The north pole of a magnet points towards the Earth's geographic south pole.
E) None of the above statements is correct..
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18
The magnetic force on a circular loop of wire of radius r carrying current I around it is zero N.
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19
A +2-μC charge is at rest in a magnetic field of 2 T pointing along the +x-axis. What is the force acting on this charge in the magnetic field?
A) -4 μN
B) +4 μN
C) -2 μN
D) +2 μN
E) 0 N
A) -4 μN
B) +4 μN
C) -2 μN
D) +2 μN
E) 0 N
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20
The magnitude of the magnetic field inside a solenoid is inversely proportional to the current flowing through the solenoid.
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21
FIGURE 22-4
When the switch is closed in the circuit shown in the sketch in Figure 22-4, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is
A) not contributing to the wire's deflection.
B) a north magnetic pole.
C) a south magnetic pole.
D) a magnetic monopole.
E) a magnetic dipole.
When the switch is closed in the circuit shown in the sketch in Figure 22-4, the wire between the poles of the horseshoe magnet deflects upward. From this you can conclude that the left end of the magnet is
A) not contributing to the wire's deflection.
B) a north magnetic pole.
C) a south magnetic pole.
D) a magnetic monopole.
E) a magnetic dipole.
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22
FIGURE 22-1
Three particles travel through a region of space where the magnetic field is out of the page, as shown in Figure 22-1. The electric charge of each of the three particles is, respectively,
A) 1 is neutral, 2 is negative, and 3 is positive.
B) 1 is neutral, 2 is positive, and 3 is negative.
C) 1 is positive, 2 is neutral, and 3 is negative.
D) 1 is positive, 2 is negative, and 3 is neutral.
E) 1 is negative, 2 is neutral, and 3 is positive.
Three particles travel through a region of space where the magnetic field is out of the page, as shown in Figure 22-1. The electric charge of each of the three particles is, respectively,
A) 1 is neutral, 2 is negative, and 3 is positive.
B) 1 is neutral, 2 is positive, and 3 is negative.
C) 1 is positive, 2 is neutral, and 3 is negative.
D) 1 is positive, 2 is negative, and 3 is neutral.
E) 1 is negative, 2 is neutral, and 3 is positive.
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23
A proton, moving north, enters a magnetic field of a certain strength. Because of this field the proton curves downward. What is the direction of the magnetic field?
A) downward
B) upward
C) towards the east
D) towards the west
E) towards the north
A) downward
B) upward
C) towards the east
D) towards the west
E) towards the north
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24
A long, straight wire carrying a current is placed along the y-axis. If the direction of the current is in the +y direction, what is the direction of the magnetic field due to this wire?
A) clockwise, around the x-axis
B) counterclockwise, around the x-axis
C) counterclockwise, around the z-axis
D) counterclockwise, around the y-axis
E) clockwise, around the y-axis
A) clockwise, around the x-axis
B) counterclockwise, around the x-axis
C) counterclockwise, around the z-axis
D) counterclockwise, around the y-axis
E) clockwise, around the y-axis
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25
FIGURE 22-5
A metal bar of mass m and length L is suspended from two conducting wires, as shown in the sketch in Figure 22-5. A uniform magnetic field points vertically downward. Choose the expression that best describes the condition satisfied by the angle θ that the suspending wires make with the vertical when the bar carries a current I.
A)
B)
C)
D)
E)
A metal bar of mass m and length L is suspended from two conducting wires, as shown in the sketch in Figure 22-5. A uniform magnetic field
points vertically downward. Choose the expression that best describes the condition satisfied by the angle θ that the suspending wires make with the vertical when the bar carries a current I.A)
B)
C)
D)
E)
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26
A wire is carrying current vertically downward. What is the direction of the force due to Earth's magnetic field on the wire?
A) horizontally towards the north
B) horizontally towards the south
C) horizontally towards the east
D) horizontally towards the west
E) vertically upward
A) horizontally towards the north
B) horizontally towards the south
C) horizontally towards the east
D) horizontally towards the west
E) vertically upward
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27
FIGURE 22-3
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section AB of this coil?
A) ILB sinθ
B) ILB cos θ
C) ILB
D) 0 N
E) ILB/2
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section AB of this coil?
A) ILB sinθ
B) ILB cos θ
C) ILB
D) 0 N
E) ILB/2
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28
FIGURE 22-3
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section BC of this coil?
A) ILB/2
B) 0 N
C) ILB sinθ
D) ILB cos θ
E) ILB
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the force acting on section BC of this coil?
A) ILB/2
B) 0 N
C) ILB sinθ
D) ILB cos θ
E) ILB
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29
FIGURE 22-3
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the direction of the force acting on section CD of this coil?
A) perpendicular to and into the page
B) perpendicular to and out of the page
C) in the direction of the magnetic field
D) in the opposite direction of the magnetic field
E) none
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the direction of the force acting on section CD of this coil?
A) perpendicular to and into the page
B) perpendicular to and out of the page
C) in the direction of the magnetic field
D) in the opposite direction of the magnetic field
E) none
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30
FIGURE 22-6
A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the sketch in Figure 22-6. The current in the wire points to the right and is of magnitude I. In which direction must current flow in the loop to produce zero magnetic field at its center?
A) counterclockwise
B) clockwise
C) It is indifferent if clockwise or counterclockwise.
D) The current in the loop should be zero A.
A single current-carrying circular loop of radius R is placed next to a long, straight wire, as shown in the sketch in Figure 22-6. The current in the wire points to the right and is of magnitude I. In which direction must current flow in the loop to produce zero magnetic field at its center?
A) counterclockwise
B) clockwise
C) It is indifferent if clockwise or counterclockwise.
D) The current in the loop should be zero A.
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31
FIGURE 22-2
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-2. If there is no current flowing through the coil, what is the force acting on section AB of the coil?
A) ILB sinθ
B) ILB cos θ
C) ILB
D) 0 N
E) None of the other answers is correct.
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-2. If there is no current flowing through the coil, what is the force acting on section AB of the coil?
A) ILB sinθ
B) ILB cos θ
C) ILB
D) 0 N
E) None of the other answers is correct.
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32
An electron moving in the positive y direction, at right angles to a magnetic field, experiences a magnetic force in the negative x direction. What is the direction of the magnetic field?
A) It is in the negative x direction.
B) It is in the positive x direction.
C) It is in the positive y direction.
D) It is in the negative z direction.
E) It is in the positive z direction.
A) It is in the negative x direction.
B) It is in the positive x direction.
C) It is in the positive y direction.
D) It is in the negative z direction.
E) It is in the positive z direction.
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33
A charged particle moving with a certain velocity along the +x-axis enters a magnetic field pointing toward the +z-axis. Because of an electric field along the +y-axis the charge particle continues to move along the +x-axis. What is the sign of this particle?
A) positive
B) negative
C) The particle could be either positive or negative.
D) None of the other choices is correct.
A) positive
B) negative
C) The particle could be either positive or negative.
D) None of the other choices is correct.
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34
An electron, moving west, enters a magnetic field of a certain strength. Because of this field the electron curves upward. What is the direction of the magnetic field?
A) towards the north
B) towards the south
C) upward
D) downward
E) towards the west
A) towards the north
B) towards the south
C) upward
D) downward
E) towards the west
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35
A proton moving in a region of a space does not experience any acceleration in the direction of motion. Which of the following statements is correct with respect to this situation?
A) The electric and magnetic fields must be perpendicular to each other in that region.
B) The electric and magnetic fields must be parallel to each other in that region.
C) Both electric and magnetic fields must be zero in that region.
D) The electric field must be zero but not the magnetic field in that region.
E) The magnetic field must be zero but not the electric field in that region.
A) The electric and magnetic fields must be perpendicular to each other in that region.
B) The electric and magnetic fields must be parallel to each other in that region.
C) Both electric and magnetic fields must be zero in that region.
D) The electric field must be zero but not the magnetic field in that region.
E) The magnetic field must be zero but not the electric field in that region.
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36
A proton is to orbit Earth at the equator using Earth's magnetic field to supply part of the necessary centripetal force. In what direction should the proton move?
A) upward
B) northward
C) southward
D) eastward
E) westward
A) upward
B) northward
C) southward
D) eastward
E) westward
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37
An electron, moving south, enters a magnetic field of certain strength. Because of this field the electron curves upward. What is the direction of the magnetic field?
A) downward
B) towards the east
C) upward
D) towards the west
E) towards the north
A) downward
B) towards the east
C) upward
D) towards the west
E) towards the north
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38
A proton, moving west, enters a magnetic field of a certain strength. Because of this magnetic field the proton curves upward. What is the direction of this magnetic field?
A) towards the west
B) towards the east
C) towards the south
D) towards the north
E) downward
A) towards the west
B) towards the east
C) towards the south
D) towards the north
E) downward
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39
FIGURE 22-3
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the direction of the force acting on section AB of this coil?
A) perpendicular to and into the page
B) perpendicular to and out of the page
C) in the direction of the magnetic field
D) in the opposite direction of the magnetic field
E) none
A rectangular coil, with corners labeled ABCD, of length L and width w is placed in a magnetic field B as shown in Figure 22-3. If there is a current I flowing through this coil, what is the direction of the force acting on section AB of this coil?
A) perpendicular to and into the page
B) perpendicular to and out of the page
C) in the direction of the magnetic field
D) in the opposite direction of the magnetic field
E) none
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40
Two long, parallel wires carry currents of different magnitudes. If the current in one of the wires is doubled and the current in the other wire is halved, what happens to the magnitude of the force between these two wires?
A) It is doubled.
B) It stays the same.
C) It is tripled.
D) It is quadrupled.
E) It is reduced by a factor of 2.
A) It is doubled.
B) It stays the same.
C) It is tripled.
D) It is quadrupled.
E) It is reduced by a factor of 2.
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41
Two long, parallel wires carry currents of different magnitudes. If the amount of current in each wire is doubled, what happens to the magnitude of the force between the wires?
A) It is quadrupled.
B) It is doubled.
C) It is tripled.
D) It stays the same.
E) It is reduced by a factor of 2.
A) It is quadrupled.
B) It is doubled.
C) It is tripled.
D) It stays the same.
E) It is reduced by a factor of 2.
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42
A proton moving with a velocity of 4.0 × 104 m/s along the +y-axis enters a magnetic field of 0.20 T directed towards the -x-axis. What is the magnitude force acting on the proton?
A) 8.0 × 10-15 N
B) 3.9 × 10-15 N
C) 2.6 × 10-15 N
D) 0 N
E) 1.3 × 10-15 N
A) 8.0 × 10-15 N
B) 3.9 × 10-15 N
C) 2.6 × 10-15 N
D) 0 N
E) 1.3 × 10-15 N
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43
What is the magnetic field at the center of a circular loop of wire of radius 4.0 cm when a current of 2.0 A flows in the wire?
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44
When you double the number of windings in a solenoid keeping all other parameters (radius, length and current) fixed, the magnetic field at the center of the solenoid will
A) double.
B) triple.
C) quadruple.
D) be reduced to one-fourth as much.
E) be reduced to half as much.
A) double.
B) triple.
C) quadruple.
D) be reduced to one-fourth as much.
E) be reduced to half as much.
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45
An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the x-y plane. Calculate the magnitude of the acceleration of the electron.
A) 1.3 × 1018 m/s2
B) 3.1 × 1018 m/s2
C) 1.3 × 10-18 m/s2
D) 3.1 × 10-18 m/s2
E) 0 m/s2
A) 1.3 × 1018 m/s2
B) 3.1 × 1018 m/s2
C) 1.3 × 10-18 m/s2
D) 3.1 × 10-18 m/s2
E) 0 m/s2
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46
A proton is accelerated from rest through 500. V. It enters a magnetic field of 0.300 T oriented perpendicular to its direction of motion. Determine:
(a) the radius of the path it follows.
(b) the frequency with which it moves around this path.
(a) the radius of the path it follows.
(b) the frequency with which it moves around this path.
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47
A long straight wire carrying 15. A is perpendicular to a 0.10 T field. Find the force per meter on the wire.
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48
A proton moving eastward with a velocity of 5.0 × 103 m/s enters a magnetic field of 0.20 T pointing northward. What is the magnitude and direction of the force that acts on the proton?
A) 0 N
B) 1.6 × 10-16 N upwards
C) 1.6 × 10-16 N downwards
D) 1.1 × 10-16 N eastwards
E) 4.4 × 10-16 N westwards
A) 0 N
B) 1.6 × 10-16 N upwards
C) 1.6 × 10-16 N downwards
D) 1.1 × 10-16 N eastwards
E) 4.4 × 10-16 N westwards
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49
A stationary proton is in a uniform magnetic field of 0.20 T. What is the magnitude of the magnetic force on the proton?
A) zero
B) 1.6 × 10-20 N
C) 3.2 × 10-20 N
D) 1.6 × 10-21 N
E) 3.2 × 10-21 N
A) zero
B) 1.6 × 10-20 N
C) 3.2 × 10-20 N
D) 1.6 × 10-21 N
E) 3.2 × 10-21 N
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50
An electron traveling due North with speed 4 × 105 m/s enters a region where the earth's magnetic field has the magnitude 5 × 10-5 T and is directed downward at 45° below horizontal. What magnitude force acts on the electron?
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51
An ion enters a mass spectrometer which has a 0.18 Tesla field perpendicular to
an electric field of 1.6 kV/m and selects a velocity. The same magnetic field is then
used to deflect the singly charged ion into a circular path of radius 12.5 cm.
(a) What velocity was selected?
(b) What was the ion mass?
an electric field of 1.6 kV/m and selects a velocity. The same magnetic field is then
used to deflect the singly charged ion into a circular path of radius 12.5 cm.
(a) What velocity was selected?
(b) What was the ion mass?
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52
A proton moving at 5.0 × 104 m/s horizontally enters a region where a magnetic field of 0.12 T is present, directed vertically downward. What magnitude force acts on the proton?
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53
A proton moving with a velocity of 4.0 × 104 m/s enters a magnetic field of 0.20 T. If the angle between the velocity of the proton and the direction of the magnetic field is 60°, what is the magnitude of the force on the proton?
A) 1.8 × 10-15 N
B) 0.60 × 10-15 N
C) 1.1 × 10-15 N
D) 2.2 × 10-15 N
E) 3.3 × 10-15 N
A) 1.8 × 10-15 N
B) 0.60 × 10-15 N
C) 1.1 × 10-15 N
D) 2.2 × 10-15 N
E) 3.3 × 10-15 N
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54
A circular loop of wire of cross-sectional area 0.12 m2 consists of 200. turns, each carrying 0.50 A. It is placed in a magnetic field of 0.050 T oriented at 30° to the plane of the loop. What torque acts on the loop?
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55
Ten meters away from a long straight wire, the field is 10-4 Tesla. What current flows through the wire?
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56
What is the magnetic moment of a rectangular loop of 120 turns that carries 6.0 A if its dimensions are 40. mm × 8.0 cm?
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57
A proton is projected with a velocity of 7.0 × 103 m/s into a magnetic field of 0.60 T perpendicular to the motion of the proton. What is the force that acts on the proton?
A) 0 N
B) 3.4 × 10-16 N
C) 4.2 × 10-16 N
D) 13 × 10-16 N
E) 6.7 × 10-16 N
A) 0 N
B) 3.4 × 10-16 N
C) 4.2 × 10-16 N
D) 13 × 10-16 N
E) 6.7 × 10-16 N
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58
An electron moves with a speed of 3.0 × 104 m/s perpendicular to a uniform magnetic field of 0.40 T. What is the magnitude of the magnetic force on the electron?
A) 4.8 × 10-14 N
B) 1.9 × 10-15 N
C) 5 × 10-20 N
D) 2.2 × 10-24 N
E) zero
A) 4.8 × 10-14 N
B) 1.9 × 10-15 N
C) 5 × 10-20 N
D) 2.2 × 10-24 N
E) zero
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59
Long parallel wires separated by 7.5 cm carry 3.3 Amperes each in opposite directions.
(a) What magnetic force per length acts on the wires?
(b) Find the magnitude of the magnetic field midway between the wires.
(a) What magnetic force per length acts on the wires?
(b) Find the magnitude of the magnetic field midway between the wires.
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60
An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the x-y plane. Calculate the magnitude of the magnetic force on the electron.
A) 2.8 × 10-10 N
B) 3.2 × 10-10 N
C) 2.8 × 10-12 N
D) 3.2 × 10-12 N
E) 0 N
A) 2.8 × 10-10 N
B) 3.2 × 10-10 N
C) 2.8 × 10-12 N
D) 3.2 × 10-12 N
E) 0 N
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61
A wire of a certain length is carrying a current of 2.0 A. It is placed at an angle of 60° with respect to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.40 N, what is the length of the wire?
A) 1.0 m
B) 1.2 m
C) 1.4 m
D) 1.6 m
E) 1.8 m
A) 1.0 m
B) 1.2 m
C) 1.4 m
D) 1.6 m
E) 1.8 m
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62
FIGURE 22-7
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.55 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section CD of this wire?
A) 0.070 N perpendicular into the page
B) 0.40 N perpendicular out of the page
C) 0.070 N perpendicular out of the page
D) 0.40 N perpendicular into the page
E) 0.20 N perpendicular out of the page
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.55 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section CD of this wire?
A) 0.070 N perpendicular into the page
B) 0.40 N perpendicular out of the page
C) 0.070 N perpendicular out of the page
D) 0.40 N perpendicular into the page
E) 0.20 N perpendicular out of the page
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63
FIGURE 22-8
A rectangular loop of wire carrying a 4.0-A current and with certain dimensions is placed in a magnetic field of 0.60 T. The magnitude of the torque acting on this wire when it makes a 60° angle with the field is 1.1 Nm. What is the area of this wire?
A) 0.20 m2
B) 0.40 m2
C) 0.26 m2
D) 0.80 m2
E) 0.53 m2
A rectangular loop of wire carrying a 4.0-A current and with certain dimensions is placed in a magnetic field of 0.60 T. The magnitude of the torque acting on this wire when it makes a 60° angle with the field is 1.1 Nm. What is the area of this wire?
A) 0.20 m2
B) 0.40 m2
C) 0.26 m2
D) 0.80 m2
E) 0.53 m2
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64
An electron moving perpendicular to a magnetic field of 3.2 × 10-2 T moves in a circle of radius 0.40 cm. How fast is this electron moving?
A) 2.3 × 107 m/s
B) 1.9 × 10-53 m/s
C) 1.9 × 10-30 m/s
D) 3.0 × 109 m/s
E) 0.80 × 107 m/s
A) 2.3 × 107 m/s
B) 1.9 × 10-53 m/s
C) 1.9 × 10-30 m/s
D) 3.0 × 109 m/s
E) 0.80 × 107 m/s
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65
A proton has a speed of 3.0 × 106 m/s in a direction perpendicular to a uniform magnetic field, and the proton moves in a circle of radius 0.20 m. What is the magnitude of the magnetic field?
A) 0.080 T
B) 0.16 T
C) 0.24 T
D) 0.32 T
E) 0.36 T
A) 0.080 T
B) 0.16 T
C) 0.24 T
D) 0.32 T
E) 0.36 T
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66
FIGURE 22-7
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on the wire?
A) 0.40 N perpendicular out of the page
B) 0.10 N perpendicular into the page
C) 0.40 N perpendicular into the page
D) 0.10 N perpendicular out of the page
E) 0.20 N perpendicular out of the page
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on the wire?
A) 0.40 N perpendicular out of the page
B) 0.10 N perpendicular into the page
C) 0.40 N perpendicular into the page
D) 0.10 N perpendicular out of the page
E) 0.20 N perpendicular out of the page
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67
FIGURE 22-7
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.65 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section BC of this wire?
A) 0 N
B) 0.090 N perpendicular out of the page
C) 0.090 N perpendicular into the page
D) 0.060 N perpendicular out of the page
E) none of the above
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.65 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section BC of this wire?
A) 0 N
B) 0.090 N perpendicular out of the page
C) 0.090 N perpendicular into the page
D) 0.060 N perpendicular out of the page
E) none of the above
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68
A straight wire 20 cm long, carrying a current of 4 A, is in a uniform magnetic field of 0.6 T. What is the force on the wire when it is at an angle of 30° with respect to the field?
A) 0.2 N
B) 0.3 N
C) 0.4 N
D) 0.5 N
E) 0.6 N
A) 0.2 N
B) 0.3 N
C) 0.4 N
D) 0.5 N
E) 0.6 N
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69
A wire of a certain length, carrying a current of 2.0 A, is placed perpendicular to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.40 N what is the length of the wire?
A) 2.0 m
B) 3.0 m
C) 1.0 m
D) 20 m
E) 40 m
A) 2.0 m
B) 3.0 m
C) 1.0 m
D) 20 m
E) 40 m
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70
A wire carrying a 2-A current is placed at an angle of 60° with the respect to a magnetic field of strength 0.2 T. If the length of the wire is 0.6 m what is the magnitude of the magnetic force acting on the wire?
A) 0.4 N
B) 0.2 N
C) 0.6 N
D) 0.8 N
E) 1.0 N
A) 0.4 N
B) 0.2 N
C) 0.6 N
D) 0.8 N
E) 1.0 N
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71
FIGURE 22-8
A rectangular loop of wire, with dimensions shown in Figure 22-8, carries a current of 2 A and is placed in a magnetic field of 0.8 T. The wire rotates in the magnetic field and at one point it is perpendicular to the magnetic field. What is the magnitude of the torque acting on the wire?
A) 0 Nm
B) 1 Nm
C) 2 Nm
D) 3 Nm
E) 4 Nm
A rectangular loop of wire, with dimensions shown in Figure 22-8, carries a current of 2 A and is placed in a magnetic field of 0.8 T. The wire rotates in the magnetic field and at one point it is perpendicular to the magnetic field. What is the magnitude of the torque acting on the wire?
A) 0 Nm
B) 1 Nm
C) 2 Nm
D) 3 Nm
E) 4 Nm
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72
FIGURE 22-7
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right side of Figure 22-7. The figure indicates the dimensions of the wire. What is the magnitude and direction of the force acting on section AB of this wire?
A) 0.20 N perpendicular out of the page
B) 0.40 N perpendicular out of the page
C) 0.11 N perpendicular out of the page
D) 0.20 N perpendicular into the page
E) 0.11 N perpendicular into the page
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.75 T in the same plane, directed as shown on the right side of Figure 22-7. The figure indicates the dimensions of the wire. What is the magnitude and direction of the force acting on section AB of this wire?
A) 0.20 N perpendicular out of the page
B) 0.40 N perpendicular out of the page
C) 0.11 N perpendicular out of the page
D) 0.20 N perpendicular into the page
E) 0.11 N perpendicular into the page
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73
A 2-m long wire is carrying a current of 2 A. The wire is placed at an angle of 60° with respect to a magnetic field. If the wire experiences a force of 0.2 N, what is the strength of the magnetic field?
A) 0.02 T
B) 0.03 T
C) 0.04 T
D) 0.05 T
E) 0.06 T
A) 0.02 T
B) 0.03 T
C) 0.04 T
D) 0.05 T
E) 0.06 T
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74
A 1.0-m long wire is carrying a certain amount of current. The wire is placed perpendicular to a magnetic field of strength 0.20 T. If the wire experiences a force of 0.60 N, what is the magnitude of the current moving through the wire?
A) 2.0 A
B) 1.0 A
C) 3.0 A
D) 4.0 A
E) 5.0 A
A) 2.0 A
B) 1.0 A
C) 3.0 A
D) 4.0 A
E) 5.0 A
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75
An electron moving perpendicular to a magnetic field of 2.2 × 10-2 T moves in a circle of certain radius. If the electron is moving with a speed of 1.5 × 107 m/s, what is the radius of the circle?
A) 1.5 × 10-3 m
B) 2.2 × 10-4 m
C) 2.2 × 10-3m
D) 3.9 × 10-4 m
E) 3.9 × 10-3 m
A) 1.5 × 10-3 m
B) 2.2 × 10-4 m
C) 2.2 × 10-3m
D) 3.9 × 10-4 m
E) 3.9 × 10-3 m
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76
FIGURE 22-7
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section DE of this wire?
A) 0.30 N perpendicular out of the page
B) 0.12 N perpendicular into the page
C) 0.30 N perpendicular into the page
D) 0.12 N perpendicular out of the page
E) 0.20 N perpendicular out of the page
A wire in the shape of an "M" lies in the plane of the paper. It carries a current of 2.0 A, flowing from A to E. It is placed in a uniform magnetic field of 0.85 T in the same plane, directed as shown in Figure 22-7. What is the magnitude and direction of the force acting on section DE of this wire?
A) 0.30 N perpendicular out of the page
B) 0.12 N perpendicular into the page
C) 0.30 N perpendicular into the page
D) 0.12 N perpendicular out of the page
E) 0.20 N perpendicular out of the page
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77
FIGURE 22-8
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetic field?
A) zero
B) 0.41 m ∙ N
C) 0.47 m ∙ N
D) 0.52 m ∙ N
E) 0.58 m ∙ N
A circular loop of wire of radius 0.50 m is in a uniform magnetic field of 0.30 T. The current in the loop is 2.0 A. What is the magnetic torque when the plane of the loop is perpendicular to the magnetic field?
A) zero
B) 0.41 m ∙ N
C) 0.47 m ∙ N
D) 0.52 m ∙ N
E) 0.58 m ∙ N
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78
An electron is accelerated from rest through a potential difference of 3750 V. It enters a region where the magnetic field is 4.0 mT perpendicular to the velocity of the electron. Calculate the radius of the path this electron will follow.
A) 1.2 cm
B) 2.2 cm
C) 3.2 cm
D) 4.2 cm
E) 5.2 cm
A) 1.2 cm
B) 2.2 cm
C) 3.2 cm
D) 4.2 cm
E) 5.2 cm
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79
A wire, 0.60 m in length, is carrying a current of 2.0 A and is placed at a certain angle with respect to the magnetic field of strength 0.30 T. If the wire experiences a force of 0.18 N, what angle does the wire make with respect to the magnetic field?
A) 20°
B) 25°
C) 30°
D) 35°
E) 60°
A) 20°
B) 25°
C) 30°
D) 35°
E) 60°
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80
FIGURE 22-8
A rectangular loop of wire, with dimensions as shown in Figure 22-8, carrying a 2-A current is placed in a magnetic field of 0.8 T. The loop rotates in the magnetic field and at one point makes a 30° angle with the magnetic field. What is the magnitude of the torque acting on the wire?
A) 0.3 Nm
B) 0.4 Nm
C) 0.5 Nm
D) 0.6 Nm
E) 0.7 Nm
A rectangular loop of wire, with dimensions as shown in Figure 22-8, carrying a 2-A current is placed in a magnetic field of 0.8 T. The loop rotates in the magnetic field and at one point makes a 30° angle with the magnetic field. What is the magnitude of the torque acting on the wire?
A) 0.3 Nm
B) 0.4 Nm
C) 0.5 Nm
D) 0.6 Nm
E) 0.7 Nm
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Unlock Deck
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