True/False
Indicate whether the
sentence or statement is true or false.
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1. |
If
a charge q exerts a force of attraction of magnitude F
on a charge –2q, then the charge –2q exerts
a force of attraction of magnitude 2F on the charge q.
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2. |
The
only difference between electric and gravitational forces is that the
electric force is larger.
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3. |
The
electric field at the surface of a conductor in static equilibrium is
perpendicular to the surface of the conductor.
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4. |
Electric field lines indicate the path that charged particles will
follow near another charged object.
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5. |
It
is safe to stay in your car during a lightning storm because the tires
act as insulators.
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6. |
The
acceleration experienced by two small charges as they start from rest
and move apart is inversely proportional to the square of the distance
between them.
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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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7. |
When
comparing the force of attraction between an electron and a proton due
to the electric force and gravity, it can be concluded that
a. |
the gravitational force is a lot stronger |
b. |
the
electric force is a lot stronger |
c. |
the two types of forces are the same |
d. |
they
cannot be compared |
e. |
the electric force is slightly stronger |
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8. |
The
electric force on each of two small charged spheres due to the other
sphere has a magnitude of F. The charge on one sphere is doubled,
and the distance between the centres of the spheres is tripled. The
magnitude of the force on each small charged sphere is
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9. |
The
magnitude of the electric field due to a small charged object is 12
N/C at a distance of 3.0 m from the charge. The field 6.0 m away from
the charge is
a. |
36
N/C |
b. |
12
N/C |
c. |
6.0
N/C |
d. |
4.0
N/C |
e. |
3.0
N/C |
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10. |
Which
diagram in Figure 1 represents the net electric field between
two charged parallel plates if a neutral conducting sphere is placed
between the plates?
Figure 1
a. |
a |
b. |
b |
c. |
c |
d. |
d |
e. |
none of these |
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11. |
A
neutral charged conductor is placed near a positively charged object.
The electric field inside the neutral conductor is
a. |
perpendicular
to the surface |
b. |
zero |
c. |
directed toward the negative charge |
d. |
stronger
than the electric field at the surface of the conductor |
e. |
none
of these |
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12. |
A
mass has a charge on it. Another small mass with a positive charge is
moved away from the first mass, which remains at rest. As the distance
increases, what happens to the gravitational potential energy Eg
and the electric potential energy EE?
a. |
Eg
decreases and EE decreases |
b. |
EE
either decreases or increases, depending on the unknown sign of
charge, and Eg decreases |
c. |
Eg decreases and EE
increases |
d. |
EE decreases or increases, depending
on the unknown sign of charge, and Eg increases |
e. |
Eg
increases and EE decreases |
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13. |
Two
isolated electrons starting from rest move apart. Which of the following
statements is true as the distance between the electrons increases?
a. |
The velocity increases and the acceleration is
constant. |
b. |
The velocity increases and the acceleration decreases. |
c. |
The velocity decreases and the acceleration is
constant. |
d. |
The velocity increases and the acceleration increases. |
e. |
The velocity is constant and the acceleration is
constant. |
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