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Magnetic Field and Force Answers

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A point charge of 5.7 µC moves at 4.5 × 105 m/s in a magnetic field that has a field strength of 3.2 mT, as shown in the diagram.

Question illustration
A
6.6 × 10–3 N
B
4.9 × 10–3 N
C
4.9 × 103 N
D
6.6 × 103 N
2
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When using the right-hand rule to determine the direction of the magnetic force on a charge, which part of the hand points in the direction of the magnetic field?

A
palm
B
fingers
C
back
D
thumb
3

The diagram shows a negative charge moving in a magnetic field.

Question illustration
A
right
B
left
C
into the screen
D
out of the screen
4

A point charge of 5.0 × 10–7 C moves to the right at 2.6 × 105 m/s in a magnetic field that is directed into the screen and has a field strength of 1.8 × 10–2 T.

A
0 N
B
2.3 × 10–3 N
C
23 N
D
2.3 × 1011 N
5

The diagram shows a positive charge moving in a magnetic field.

Question illustration
A
into the screen
B
out of the screen
C
up
D
down
6

A current in a wire increases from 2 A to 6 A. How will the magnetic field 0.01 m from the wire change?

A
It increases to four times its original value.
B
It increases to three times its original value.
C
It decreases to one-fourth its original value.
D
It decreases to one-third its original value.
7

The magnetic field 0.02 m from a wire is 0.1 T. What is the magnitude of the magnetic field 0.01 m from the same wire?

A
0.01 T
B
0.05 T
C
0.1 T
D
0.2 T
8

When using the right-hand rule to determine the direction of the magnetic field around a current-carrying straight wire, which part of the right hand points in the direction of the magnetic field?

A
palm
B
fingers
C
back
D
thumb
9

The strength of a magnetic field around a wire carrying a current of 20 A is 0.004 T. What is the strength of the magnetic field if the current is changed to 40 A?

A
0.002 T
B
0.004 T
C
0.006 T
D
0.008 T
10

What direction can the charge move and experience no magnetic force? Check all that apply.

A
up
B
down
C
left
D
right
E
into the screen
F
out of the screen
11

What direction can the charge move and experience no magnetic force? Check all that apply.

A
up
B
down
C
left
D
right
E
into the screen
F
out of the screen
12

Which equation is used to calculate the magnetic force on a charge moving in a magnetic field?

A
F = |q|vBcos
Option A
B
F = |q|vBsin
Option B
C
F = |q|Bcos
Option C
D
F = |q|Bsin
Option D
13

[BLANK]

A
fingers
B
palm
C
back
D
thumb
14

A wire runs left to right and carries a current in the direction shown.

Question illustration
A
left
B
right
C
into the screen
D
out of the screen
15

What must be known to determine the direction of the magnetic force on a charge? Check all that apply.

A
the type of the charge
B
the amount of the charge
C
the direction of the magnetic field
D
the velocity of the charge
E
the strength of the magnetic field
16

A point charge of 5.0 × 10–7 C moves to the right at 2.6 × 105 m/s in a magnetic field that is directed into the screen and has a field strength of 1.8 × 10–2 T.

A
0 N
B
2.3 × 10–3 N
C
23 N
D
2.3 × 1011 N
17

A wire runs left to right and carries a current in the direction shown.

Question illustration
A
left
B
right
C
into the screen
D
out of the screen
18

A wire perpendicular to the screen carries a current in the direction shown.

Question illustration
A
up
B
down
C
left
D
right
19

When using the right-hand rule to determine the direction of the magnetic force on a charge, which part of the hand points in the direction that the charge is moving?

A
palm
B
fingers
C
back
D
thumb

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