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
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
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)
1/2F
(B)
0
(C)
2F
(D)
F
(E)
–F
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)
1/4F
(B)
1/2F
(C)
F
(D)
2F
(E)
4F
5.
Four charged particles are arranged
in a square, as shown above. What is the direction of the force acting
on particle A?
(A)
(B)
(C)
(D)
(E)
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
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)
1/8F
(B)
1/4F
(C)
1/2F
(D)
F
(E)
2F
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)
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
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
, of particle A?
< –q
< 0
= 0
< +q
> +q
