Physics Principles and Problems 2009

Chapter 24: Magnetic Fields

Standardized Test Practice

1
The illustration shows the direction in which a particle moves through a magnetic field. The particle moves with a speed of 2.8 × 106 m/s. The magnetic field, B = 3.7 × 10–2 T, exerts a force of 2.2 × 10–12 N on the particle. What is the particle's charge?

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A)–1.7 × 10–17 C
B)2.1 × 10–17 C
C)–2.1 × 10–17 C
D)1.7 × 10–17 C
2
If a different particle, with a charge –3.2 × 10–19 C, then moves through the field with a speed of 2.8 × 106 m/s, what would the field strength need to be to exert the same magnitude of force?

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A)1.9 T
B)2.5 T
C)4.0 T
D)4.9 T
3
What current is required to produce a force of 0.62 N on a 9.4-cm length of wire at right angles to a 0.18-T field?
A)0.37 A
B)1.1 A
C)11 A
D)37 A
4
The illustration below shows a straight current-carrying wire in a uniform magnetic field, oriented at right angles to the wire. The 0.25-m wire carries a 4.75-A current and experiences a force of 0.38 N. What is the strength of the magnetic field?

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A)0.32 T
B)0.45 T
C)0.56 T
D)0.72 T
5
What is the force on a 0.20-m straight wire carrying 4.0 A of current in a magnetic field with a strength of 0.40 T if the wire is at right angles to the field?
A)0.32 N
B)0.30 N
C)0.18 N
D)0.12 N
6
A straight wire carrying a 6.0-A current moving in a magnetic field with strength 0.50 T at right angles to the field has 0.30 N of force on it. How long is the wire?
A)5.0 cm
B)10 cm
C)15 cm
D)20 cm
7
A particle with a charge of –3.2 × 10–19 C passes through a magnetic field of strength 0.60 T at right angles to the field. The magnitude of the force on the particle is 2.6 × 10–14 N. What is the particle's speed?
A)5.0 × 104 m/s
B)7.4 × 104 m/s
C)1.4 × 105 m/s
D)4.9 × 105 m/s
8
What is the magnitude of the force on a particle moving at a speed of 3.0 × 106 m/s perpendicular to a magnetic field with a strength of 0.60 T, if the particle has a charge of –1.3 × 10–17 C?
A)1.7 × 10–11 N
B)2.3 × 10–11 N
C)3.8 × 10–11 N
D)4.2 × 10–11 N
9
How are electric charges and magnetic poles similar?
A)both are plus and minus
B)unlike attract and like repel
C)unlike repel and like attract
D)both change to positive and negative charges
10
Which would result in an electromagnet?
A)attach a natural magnet to a battery
B)line up the north and south poles of a magnet with an electric wire
C)run a current through a wire wrapped around an iron rod
D)wrap a magnet around a piece of wire with a current passing through it
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