True/False
Indicate whether the
sentence or statement is true or false.
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1. |
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. |
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. |
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. |
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. |
The
magnetic field on the outside of a coaxial cable is proportional to
the current in the cable.
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6. |
The
magnetic field inside a long, straight coil with many closely packed
turns is essentially uniform.
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7. |
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. |
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. |
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. |
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. |
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. |
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. |
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. |
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d. |
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b. |
2r |
e. |
none of these |
c. |
3r |
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