True/False
Indicate whether the sentence or statement is true
or false.
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1.
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A
charge moving in a direction perpendicular to a uniform magnetic field experiences a force, but its
velocity does not change.
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2.
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When
a charged particle is fired into and perpendicular to a uniform magnetic field, it moves along a
circular path until it escapes the field.
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3.
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The
force on a conductor in a uniform magnetic field is perpendicular to both the current in the
conductor and the magnetic field.
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4.
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Reversing the direction of the current in a conductor in a uniform magnetic field
reverses the direction of the force on the conductor.
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5.
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The
magnetic field on the outside of a coaxial cable is proportional to the current in the
cable.
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6.
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The
magnetic field inside a long, straight coil with many closely packed turns is essentially
uniform.
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7.
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It is
possible to shield against gravitational, electric, and magnetic fields.
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Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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8.
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A charged
particle is placed into a uniform magnetic field with an initial velocity of zero. If no electric or
gravitational forces act on the particle, then it a. | accelerates straight forward | b. | does not
move | c. | moves in a
circle | d. | moves at constant speed | e. | none of
these | | |
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9.
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If particles
with the same initial velocity and charge pass into and perpendicular to a uniform magnetic field,
then a. | the radius of curvature
is the same for each particle | b. | the radius of curvature is greater for the more massive
particles | c. | the radius of curvature is greater for the less massive
particles | d. | all the particles spiral with decreasing radius under all
circumstances | e. | none of the these | | |
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10.
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If two
wires, with currents as in Figure 1, cross each other at right angles, one slightly above the
other, forming four regions, which region has the strongest magnetic field pointing out of the
page?
 Figure 1
a. | I | b. | II | c. | III | d. | IV | e. | The fields are the same in each region. | | |
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11.
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Particles A,
B, C, and D with the same charge and speed are placed into a uniform magnetic field (Figure
2). Which one experiences the smallest force?
 Figure 2
a. | A | b. | B | c. | C | d. | D | e. | They all experience the same force. | | |
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12.
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Four
particles with the same charge and speed are placed into a uniform magnetic field (Figure 2).
Which particle experiences a force directed into the page? a. | A | b. | B | c. | C | d. | D | e. | They all experience a force out of the page. | | |
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13.
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The
magnitude of the magnetic field a distance r from a long, straight conductor with current
I is B. The same magnetic field will have magnitude 2B if the current is tripled
at a distance of a. | | d. | | b. | 2r | e. | none of these | c. | 3r | | | | |
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