Question 1

A 1.0-m wire segment carrying a current of 0.55 A oriented parallel to a uniform magnetic field of 0.80 T experiences a force of what magnitude?

Accepted Answer

A) 0.44 N 
B) 0.22 N 
C) 0.70 N 
D) 0.35 N 
E) 0.00 N 
A) 0.44 N 
B) 0.22 N 
C) 0.70 N 
D) 0.35 N 
E) 0.00 N E

Question 2

The magnetic pole of the Earth nearest the geographic North Pole corresponds to which of the following?

Accepted Answer

A) a magnetic north pole 
B) a magnetic south pole 
C) a magnetic arctic pole 
D) a magnetic Antarctic pole 
A) a magnetic north pole 
B) a magnetic south pole 
C) a magnetic arctic pole 
D) a magnetic Antarctic pole B

Question 3

A solenoid with 568 turns,0.19 m long,carrying a current of 3.5 A and with a radius of 10−2 m will have what strength magnetic field at its center? (magnetic permeability in empty space µ0 = 4π × 10−7 T⋅m/A)

Accepted Answer

A) 1.2E-1 T 
B) 3.3E-3 T 
C) 2.5E-3 T 
D) 1.3E-2 T 
E) ​4.1E-2 T 
A) 1.2E-1 T 
B) 3.3E-3 T 
C) 2.5E-3 T 
D) 1.3E-2 T 
E) ​4.1E-2 T D

Question 4

A wire in a uniform magnetic field of 0.350 T carries a current of 3.50 A.If the magnitude of the magnetic force per unit length on the wire is 0.278 N/m,what is the angle between the magnetic field and the current?

Accepted Answer

A) 13.1° 
B) 19.9° 
C) 4.56° 
D) 52.6° 
A) 13.1° 
B) 19.9° 
C) 4.56° 
D) 52.6°

Question 5

A square coil and a triangular coil each have sides of length L.The triangular coil has twice as many turns as the square coil.If a the same current is sent through each coil,when the coils are placed in the same uniform magnetic field making an angle of 30° with the planes of the coils,which coil experiences the greater torque?

Accepted Answer

A) the square coil 
B) the triangular coil 
C) Both coils experience the same torque. 
D) It depends on the magnitude of the magnetic field that the coils are placed in. 
A) the square coil 
B) the triangular coil 
C) Both coils experience the same torque. 
D) It depends on the magnitude of the magnetic field that the coils are placed in.

Question 6

At the Fermilab accelerator in Weston,Illinois,singly-charged ions with momentum 3.3 × 10−16 kg⋅m/s are held in a circular orbit of radius 1.00 km by an upward magnetic field.What B field must be used to maintain the ions in this orbit? (qion = 1.60 × 10−19 C)

Accepted Answer

A) 5.3 T 
B) 2.1 T. 
C) 2.1 T 
D) 0.19 T 
E) 0.48 T 
A) 5.3 T 
B) 2.1 T. 
C) 2.1 T 
D) 0.19 T 
E) 0.48 T

Question 7

The dip angle is:

Accepted Answer

A) another term for magnetic declination. 
B) a measure of the tendency for a compass to point south. 
C) close to or at zero near the equator. 
D) close to or at zero just north of Hudson Bay. 
A) another term for magnetic declination. 
B) a measure of the tendency for a compass to point south. 
C) close to or at zero near the equator. 
D) close to or at zero just north of Hudson Bay.

Question 8

Two singly ionized isotopes,X and Y,of the same element move with the same speed perpendicular to a uniform magnetic field.Isotope X follows a path of radius 3.37 cm while isotope Y moves along a path 3.58 cm in radius.What is the ratio of the two isotope masses,  
?

Accepted Answer

A) 0.941 
B) 1.06 
C) 0.886 
D) 1.13 
E) Not enough information is given. 
A) 0.941 
B) 1.06 
C) 0.886 
D) 1.13 
E) Not enough information is given.

Question 9

A proton,mass 1.67 × 10−27 kg and charge +1.6 × 10−19 C,moves in a circular orbit perpendicular to a uniform magnetic field of 0.86 T.Find the time for the proton to make one complete circular orbit.

Accepted Answer

A) 2.4 × 10−8 s 
B) 7.6 × 10−8 s 
C) 3.8 × 10−8 s 
D) 1.2 × 10−8 s 
E) Not enough information is given. 
A) 2.4 × 10−8 s 
B) 7.6 × 10−8 s 
C) 3.8 × 10−8 s 
D) 1.2 × 10−8 s 
E) Not enough information is given.

Question 10

A circular current loop is placed in an external magnetic field.How is the torque related to the radius of the loop?

Accepted Answer

A) directly proportional to radius 
B) inversely proportional to radius 
C) directly proportional to radius squared 
D) inversely proportional to radius squared 
A) directly proportional to radius 
B) inversely proportional to radius 
C) directly proportional to radius squared 
D) inversely proportional to radius squared

Question 11

Two parallel wires are separated by 0.25 m.Wire A carries 5.0 A and Wire B carries 10 A,both currents in the same direction.The force on 0.80 m of Wire A is:

Accepted Answer

A) half that on 0.80 m of wire B. 
B) one-fourth that on 0.80 m of wire B. 
C) toward Wire B. 
D) away from Wire B. 
A) half that on 0.80 m of wire B. 
B) one-fourth that on 0.80 m of wire B. 
C) toward Wire B. 
D) away from Wire B.

Question 12

When an electromagnet has an iron core inserted,what happens to the strength of the magnet?

Accepted Answer

A) It increases. 
B) It remains the same. 
C) It decreases. 
D) Since it depends on the metal used in the wires of the electromagnet,any of the above. 
A) It increases. 
B) It remains the same. 
C) It decreases. 
D) Since it depends on the metal used in the wires of the electromagnet,any of the above.

Question 13

A proton with initial kinetic energy KE is moving in circular motion in a uniform magnetic field.When it has completed one eighth of a revolution,what is its kinetic energy?

Accepted Answer

A) 1.4KE 
B) 0.71KE 
C) KE 
D) The value is not given. 
A) 1.4KE 
B) 0.71KE 
C) KE 
D) The value is not given.

Question 14

A copper wire of length 25.0 cm is in a magnetic field of 0.36 T.If it has a mass of 11.0 g,what is the minimum current through the wire that would cause a magnetic force equal to its weight?

Accepted Answer

A) 12 A 
B) 0.48 A 
C) 1.2 A 
D) 3.3 A 
E) 0.75 A 
A) 12 A 
B) 0.48 A 
C) 1.2 A 
D) 3.3 A 
E) 0.75 A

Question 15

Two parallel wires are separated by 0.36 m.Wire A carries 4.8 A and Wire B carries 8.9 A,both currents in the same direction.The force on 0.53 m of Wire A is:

Accepted Answer

A) 1.3E-5 N. 
B) 4.5E-5 N. 
C) 2.6E-6 N. 
D) 1.4E-6 N. 
E) 4.0E-5 N. 
A) 1.3E-5 N. 
B) 4.5E-5 N. 
C) 2.6E-6 N. 
D) 1.4E-6 N. 
E) 4.0E-5 N.

Question 16

​An electron is accelerated from rest through 2300 V and then enters a region of uniform magnetic field with magnitude 1.25 T.What is the magnitude of the maximum magnetic force acting on the electron?

Accepted Answer

A) ​5.68E-12 N 
B) ​4.02E-12 N 
C) ​4.07E-12 N 
D) ​2.03E-12 N 
A) ​5.68E-12 N 
B) ​4.02E-12 N 
C) ​4.07E-12 N 
D) ​2.03E-12 N

Question 17

Three identical bar magnets,each 2 cm long,are placed in a straight line on a frictionless surface with their ends equally spaced with 2 cm between ends.They are constrained so they cannot rotate,but they can slide along the straight line.The left magnet has its north pole nearest the north pole of the middle magnet,and the right magnet has its south pole toward the middle magnet's south pole.Once they are in place and released from rest,which of the following best describes the motion of the magnets?

Accepted Answer

A) The end magnets will move away from the center magnet. 
B) The magnets will not move since they are equally spaced. 
C) The magnets will snap together. 
D) None of the above would happen. 
A) The end magnets will move away from the center magnet. 
B) The magnets will not move since they are equally spaced. 
C) The magnets will snap together. 
D) None of the above would happen.

Question 18

A current in a solenoid with N turns creates a magnetic field at the center of that loop.The field strength is directly proportional to:

Accepted Answer

A) number of turns in the loop. 
B) current strength. 
C) Both choices A and B are valid. 
D) None of the above are valid. 
A) number of turns in the loop. 
B) current strength. 
C) Both choices A and B are valid. 
D) None of the above are valid.

Question 19

Electrical charges and magnetic poles have many similarities,but one difference is:

Accepted Answer

A) opposite magnetic poles repel. 
B) one magnetic pole cannot create magnetic poles in other materials. 
C) a magnetic pole cannot be isolated. 
D) magnetic poles do not produce magnetic fields. 
A) opposite magnetic poles repel. 
B) one magnetic pole cannot create magnetic poles in other materials. 
C) a magnetic pole cannot be isolated. 
D) magnetic poles do not produce magnetic fields.

Question 20

There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper.If the magnetic field B is toward the right,and if each side of the loop has length L,then the net magnetic torque acting on the loop is

Accepted Answer

A) 2ILB. 
B) ILB. 
C) IBL2. 
D) zero. 
A) 2ILB. 
B) ILB. 
C) IBL2. 
D) zero.

Exam 19: Magnetism

A 1.0-m wire segment carrying a current of 0.55 A oriented parallel to a uniform magnetic field of 0.80 T experiences a force of what magnitude?

The magnetic pole of the Earth nearest the geographic North Pole corresponds to which of the following?

A solenoid with 568 turns,0.19 m long,carrying a current of 3.5 A and with a radius of 10−2 m will have what strength magnetic field at its center? (magnetic permeability in empty space µ0 = 4π × 10−7 T⋅m/A)

A wire in a uniform magnetic field of 0.350 T carries a current of 3.50 A.If the magnitude of the magnetic force per unit length on the wire is 0.278 N/m,what is the angle between the magnetic field and the current?

At the Fermilab accelerator in Weston,Illinois,singly-charged ions with momentum 3.3 × 10−16 kg⋅m/s are held in a circular orbit of radius 1.00 km by an upward magnetic field.What B field must be used to maintain the ions in this orbit? (qion = 1.60 × 10−19 C)

The dip angle is:

Two singly ionized isotopes,X and Y,of the same element move with the same speed perpendicular to a uniform magnetic field.Isotope X follows a path of radius 3.37 cm while isotope Y moves along a path 3.58 cm in radius.What is the ratio of the two isotope masses, ?

A proton,mass 1.67 × 10−27 kg and charge +1.6 × 10−19 C,moves in a circular orbit perpendicular to a uniform magnetic field of 0.86 T.Find the time for the proton to make one complete circular orbit.

A circular current loop is placed in an external magnetic field.How is the torque related to the radius of the loop?

Two parallel wires are separated by 0.25 m.Wire A carries 5.0 A and Wire B carries 10 A,both currents in the same direction.The force on 0.80 m of Wire A is:

When an electromagnet has an iron core inserted,what happens to the strength of the magnet?

A proton with initial kinetic energy KE is moving in circular motion in a uniform magnetic field.When it has completed one eighth of a revolution,what is its kinetic energy?

A copper wire of length 25.0 cm is in a magnetic field of 0.36 T.If it has a mass of 11.0 g,what is the minimum current through the wire that would cause a magnetic force equal to its weight?

Two parallel wires are separated by 0.36 m.Wire A carries 4.8 A and Wire B carries 8.9 A,both currents in the same direction.The force on 0.53 m of Wire A is:

​An electron is accelerated from rest through 2300 V and then enters a region of uniform magnetic field with magnitude 1.25 T.What is the magnitude of the maximum magnetic force acting on the electron?

A current in a solenoid with N turns creates a magnetic field at the center of that loop.The field strength is directly proportional to:

Electrical charges and magnetic poles have many similarities,but one difference is:

There is a current I flowing in a clockwise direction in a square loop of wire that is in the plane of the paper.If the magnetic field B is toward the right,and if each side of the loop has length L,then the net magnetic torque acting on the loop is

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A solenoid with 568 turns,0.19 m long,carrying a current of 3.5 A and with a radius of 10−² m will have what strength magnetic field at its center? (magnetic permeability in empty space µ₀ = 4π × 10−⁷ T⋅m/A)

At the Fermilab accelerator in Weston,Illinois,singly-charged ions with momentum 3.3 × 10−¹⁶ kg⋅m/s are held in a circular orbit of radius 1.00 km by an upward magnetic field.What B field must be used to maintain the ions in this orbit? (qion = 1.60 × 10−¹⁹ C)

A proton,mass 1.67 × 10−²⁷ kg and charge +1.6 × 10−¹⁹ C,moves in a circular orbit perpendicular to a uniform magnetic field of 0.86 T.Find the time for the proton to make one complete circular orbit.

An electron is accelerated from rest through 2300 V and then enters a region of uniform magnetic field with magnitude 1.25 T.What is the magnitude of the maximum magnetic force acting on the electron?