Practice Questions
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| 1. |
When
a long-haired woman puts her hands on a Van de Graaff generator—a
large conducting sphere with charge being delivered to it by a conveyer
belt—her hair stands on end. Which of the following explains this
phenomenon? |
| (A) |
Like charges attract |
| (B) |
Like charges repel |
| (C) |
Her hair will not stand on end |
| (D) |
Her body is conducting a current to the ground |
| (E) |
The Van de Graaf generator makes a magnetic field that
draws her hair up on end |
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| 2. |
Three particles, A, B,
and C, are set in a line, with a distance of d between
each of them, as shown above. If particle B is
attracted to particle A, what can we say about
the charge,  , of particle A? |
| (A) |
 < –q |
| (B) |
–q <  < 0 |
| (C) |
 = 0 |
| (D) |
0 <  < +q |
| (E) |
 > +q |
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| 3. |
A
particle of charge +2q exerts a force F on
a particle of charge –q. What is the force exerted
by the particle of charge –q on the particle of
charge +2q? |
| (A) |
1/2 F |
| (B) |
0 |
| (C) |
2F |
| (D) |
F |
| (E) |
–F |
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| 4. |
Two
charged particles exert a force of magnitude F on
one another. If the distance between them is doubled and the charge
of one of the particles is doubled, what is the new force acting
between them? |
| (A) |
1/4 F |
| (B) |
1/2 F |
| (C) |
F |
| (D) |
2F |
| (E) |
4F |
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| 5. |
Four charged particles are arranged
in a square, as shown above. What is the direction of the force acting
on particle A? |
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| (A) |
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| (B) |
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| (C) |
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| (D) |
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| (E) |
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| 6. |
Two identical positive charges
of +Q are 1 m apart. What is the magnitude and
direction of the electric field at point A, 0.25
m to the right of the left-hand charge? |
| (A) |
3/4 kQ to
the right |
| (B) |
128/9 kQ to
the left |
| (C) |
160/9 kQ to
the left |
| (D) |
160/9 kQ to
the right |
| (E) |
128/9 kQ to
the right |
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| 7. |
A
particle of charge +q is a distance r away
from a charged flat surface and experiences a force of magnitude F pulling
it toward the surface. What is the magnitude of the force exerted
on a particle of charge +q that is a distance 2r from
the surface? |
| (A) |
1/8 F |
| (B) |
1/4 F |
| (C) |
1/2 F |
| (D) |
F |
| (E) |
2F |
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| 8. |
What
is the change in potential energy of a particle of charge +q that
is brought from a distance of 3r to a distance
of 2r by a particle of charge –q? |
| (A) |
 |
| (B) |
 |
| (C) |
 |
| (D) |
 |
| (E) |
 |
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| 9. |
Two
charges are separated by a distance d. If the distance
between them is doubled, how does the electric potential between
them change? |
| (A) |
It is doubled |
| (B) |
It is halved |
| (C) |
It is quartered |
| (D) |
It is quadrupled |
| (E) |
It is unchanged |
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| 10. |
A
solid copper sphere has a charge of +Q on it. Where
on the sphere does the charge reside? |
| (A) |
+Q at the center of the sphere |
| (B) |
Q/2 at the center of the sphere and Q/2
on the outer surface |
| (C) |
–Q at the center of the sphere and +2Q on
the outer surface |
| (D) |
+Q on the outer surface |
| (E) |
The charge is spread evenly throughout the sphere |
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