Question 1

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 points A to E,as shown in the figure.It is placed in a uniform magnetic field of 0.75 T in the same plane,directed as shown on the right side of the figure.The figure indicates the dimensions of the wire.What are the magnitude and direction of the force acting on  
(a)section AB of this wire?
(b)section BC of this wire?
(c)section CD of this wire?
(d)section DE of this wire?
(e)the entire wire?

Accepted Answer

The answer of A wire in the shape of an...

Question 2

An electron moving with a velocity  = 5.0 × 107 m/s 
Enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is 
= 
)What magnetic field will allow the electron to go through the region without being deflected?

Accepted Answer

A)   = +2.0 × 10-4 T
 
B)   = -2.0 × 10-4 T
 
C)   = +2.0 × 10-4 T
 
D)   = -2.0 × 10-4 T
 
E)   = +5.0 × 10-4 T

Question 3

A straight wire that is 0.60 m long is carrying a current of 2.0 A.It is placed in a uniform 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?

Accepted Answer

A)  25° 
B)  30° 
C)  35° 
D)  60° 
E)  90°

Question 4

An alpha particle is moving at a speed of 5.0 × 10⁵ m/s in a direction perpendicular to a uniform magnetic field of strength 0.040 T.The charge on an alpha particle is 3.2 × 10^-19 C and its mass is 6.6 × 10^-27 kg. (a)What is the radius of the path of the alpha particle? (b)How long does it take the alpha particle to make one complete revolution around its path?

Accepted Answer

The answer of An alpha particle is moving at a...

Question 5

A beam of electrons is accelerated through a potential difference of 10 kV before entering a region having uniform electric and magnetic fields that are perpendicular to each other and perpendicular to the direction in which the electron is moving. If the magnetic field in this region has a value of 0.010 T,what magnitude of the electric field is required if the particles are to be undeflected as they pass through the region?

Accepted Answer

A)  2.3 × 103 V/m 
B)  7.9 × 103 V/m 
C)  5.9 × 105 V/m 
D)  6.0 × 105 V/m 
E)  7.2 × 106 V/m

Question 6

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.The electric charge of each of the three particles is,respectively,

Accepted Answer

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.

Question 7

The figure shows a velocity selector that can be used to measure the speed of a charged particle.A beam of particles is directed along the axis of the instrument.A parallel plate capacitor sets up an electric field E,which is oriented perpendicular to a uniform magnetic field B.If the plates are separated by
2)0 mm and the value of the magnetic field is 0.60 T,what voltage between the plates will allow particles of speed 5.0 × 105 m/s to pass straight through without deflection?

Accepted Answer

A)  600 V 
B)  1900 V 
C)  3800 V 
D)  190 V 
E)  94 V

Question 8

A doubly charged ion (charge 2e)with velocity 6.9 × 106 m/s moves in a circular path of diameter
60)0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion?
(e = 1.60 × 10-19C)

Accepted Answer

A)  11 × 10-27 kg 
B)  6.7 × 10-27 kg 
C)  4.5 × 10-27 kg 
D)  3.3 × 10-27 kg

Question 9

An electron enters a magnetic field of 0.75 T with a velocity perpendicular to the direction of the field.At what frequency does the electron traverse a circular path? (mel = 9.11 × 10-31 kg,e = 1.60 × 10-19C)

Accepted Answer

A)  2.1 × 1010 Hz 
B)  4.8 × 10-7 Hz 
C)  2.1 × 1014 Hz 
D)  4.8 × 10-11 Hz

Question 10

A particle with charge -5.00 C initially moves at  = (1.00 
+ 7)00 
)m/s. If it encounters a magnetic field 
Find the magnetic force vector on the particle.

Accepted Answer

A)  (-350  + 50.0
 ) N 
B)  (-350  - 50.0
 ) N 
C)  (350  + 50.0
 ) N 
D)  (350  - 50.0
 ) N

Question 11

A charged particle is moving with speed v perpendicular to a uniform magnetic field.A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field.If the frequency of revolution of the first particle is f,the frequency of revolution of the second particle is

Accepted Answer

A)  f. 
B)  2f. 
C)  4f. 
D)  f/2. 
E)  f/4.

Question 12

A current carrying loop of wire lies flat on a table top.When viewed from above,the current moves around the loop in a counterclockwise sense.
(a)For points OUTSIDE the loop,the magnetic field caused by this current
 A)circles the loop in a clockwise direction.
 B)circles the loop in a counterclockwise direction.
 C)points straight up.
 D)points straight down.
 E)is zero.
(b)For points INSIDE the loop,the magnetic field caused by this current\
 A)circles the loop in a clockwise direction.
 B)circles the loop in a counterclockwise direction.
 C)points straight up.
 D)points straight down.
 E)is zero.

Accepted Answer

The answer of A current carrying loop of wire lies...

Question 13

A vertical wire carries a current straight down.To the east of this wire,the magnetic field points

Accepted Answer

A)  toward the north. 
B)  toward the east. 
C)  toward the west. 
D)  toward the south. 
E)  downward.

Question 14

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path.If the heavier ions follow a circular arc of radius R,what is the radius of the arc followed by the lighter?

Accepted Answer

A)  4R 
B)  3R 
C)   R 
D)  R/  
E)  R/2

Question 15

A straight 15.0-g wire that is 2.00 m long carries a current of 8.00 A.This wire is aligned horizontally along the west-east direction with the current going from west to east.You want to support the wire against gravity using the weakest possible uniform external magnetic field.
(a)Which way should the magnetic field point?
(b)What is the magnitude of the weakest possible magnetic field you could use?

Accepted Answer

The answer of A straight 15.0-g wire that is 2.00...

Question 16

A proton,with mass 1.67 × 10^-²⁷ kg and charge +1.6 × 10^-19 C,is sent with velocity 7.1 × 10⁴ m/s in the +x direction into a region where there is a uniform electric field of magnitude 730 V/m in the +y direction.What are the magnitude and direction of the uniform magnetic field in the region,if the proton is to pass through undeflected? Assume that the magnetic field has no x-component and neglect gravitational effects.

Accepted Answer

The answer of A proton,with mass 1.67 × 10^-²⁷ kg...

Question 17

In a mass spectrometer,a singly-charged particle (charge e)has a speed of 1.0 × 106 m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit of the particle is 0.020 m. What is the mass of this particle? (e = 1.60 × 10-19C)

Accepted Answer

A)  3.2 × 10-28 kg 
B)  6.4 × 10-28 kg 
C)  1.7 × 10-27 kg 
D)  4.5 × 10-27 kg

Exam 27: Magnetic Interactions

An electron moving with a velocity = 5.0 × 10⁷ m/s Enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is = ) What magnetic field will allow the electron to go through the region without being deflected?

A straight wire that is 0.60 m long is carrying a current of 2.0 A.It is placed in a uniform 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?

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.The electric charge of each of the three particles is,respectively,

A doubly charged ion (charge 2e) with velocity 6.9 × 10⁶ m/s moves in a circular path of diameter 60) 0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10^-19C)

An electron enters a magnetic field of 0.75 T with a velocity perpendicular to the direction of the field.At what frequency does the electron traverse a circular path? (m_el = 9.11 × 10^-31 kg,e = 1.60 × 10^-19C)

A particle with charge -5.00 C initially moves at = (1.00 + 7) 00 ) m/s. If it encounters a magnetic field Find the magnetic force vector on the particle.

A charged particle is moving with speed v perpendicular to a uniform magnetic field.A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field.If the frequency of revolution of the first particle is f,the frequency of revolution of the second particle is

A vertical wire carries a current straight down.To the east of this wire,the magnetic field points

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path.If the heavier ions follow a circular arc of radius R,what is the radius of the arc followed by the lighter?

In a mass spectrometer,a singly-charged particle (charge e) has a speed of 1.0 × 10⁶ m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit of the particle is 0.020 m. What is the mass of this particle? (e = 1.60 × 10^-19C)

Exam 27: Magnetic Interactions

An electron moving with a velocity = 5.0 × 107 m/s Enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is = ) What magnetic field will allow the electron to go through the region without being deflected?

A straight wire that is 0.60 m long is carrying a current of 2.0 A.It is placed in a uniform 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?

Three particles travel through a region of space where the magnetic field is out of the page,as shown in the figure.The electric charge of each of the three particles is,respectively,

A doubly charged ion (charge 2e) with velocity 6.9 × 106 m/s moves in a circular path of diameter 60) 0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10-19C)

An electron enters a magnetic field of 0.75 T with a velocity perpendicular to the direction of the field.At what frequency does the electron traverse a circular path? (mel = 9.11 × 10-31 kg,e = 1.60 × 10-19C)

A particle with charge -5.00 C initially moves at = (1.00 + 7) 00 ) m/s. If it encounters a magnetic field Find the magnetic force vector on the particle.

A charged particle is moving with speed v perpendicular to a uniform magnetic field.A second identical charged particle is moving with speed 2v perpendicular to the same magnetic field.If the frequency of revolution of the first particle is f,the frequency of revolution of the second particle is

A vertical wire carries a current straight down.To the east of this wire,the magnetic field points

Ions having equal charges but masses of M and 2M are accelerated through the same potential difference and then enter a uniform magnetic field perpendicular to their path.If the heavier ions follow a circular arc of radius R,what is the radius of the arc followed by the lighter?

In a mass spectrometer,a singly-charged particle (charge e) has a speed of 1.0 × 106 m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit of the particle is 0.020 m. What is the mass of this particle? (e = 1.60 × 10-19C)

An electron moving with a velocity = 5.0 × 10⁷ m/s Enters a region of space where perpendicular electric and a magnetic fields are present.The electric field is = ) What magnetic field will allow the electron to go through the region without being deflected?

A doubly charged ion (charge 2e) with velocity 6.9 × 10⁶ m/s moves in a circular path of diameter 60) 0 cm in a magnetic field of 0.80 T in a mass spectrometer. What is the mass of this ion? (e = 1.60 × 10^-19C)

An electron enters a magnetic field of 0.75 T with a velocity perpendicular to the direction of the field.At what frequency does the electron traverse a circular path? (m_el = 9.11 × 10^-31 kg,e = 1.60 × 10^-19C)

In a mass spectrometer,a singly-charged particle (charge e) has a speed of 1.0 × 10⁶ m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit of the particle is 0.020 m. What is the mass of this particle? (e = 1.60 × 10^-19C)