Download Exam ew7 Name MULTIPLE CHOICE. Choose the one alternative

ew7
Exam
Name
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Which of the following is not a vector?
1)
A) electric field
B) electric potentia;
C) electric line of force
D) electric force
2) For a proton moving in the direction of the electric field
2)
A) its potential energy increases and its electric potential increases.
B) its potential energy decreases and its electric potential increases.
C) its potential energy increases and its electric potential decreases.
D) its potential energy decreases and its electric potential decreases.
3) For an electron moving in a direction opposite to the electric field
3)
A) its potential energy decreases and its electric potential decreases.
B) its potential energy increases and its electric potential increases.
C) its potential energy increases and its electric potential decreases.
D) its potential energy decreases and its electric potential increases.
4) One joule per coulomb is a
A) electron-volt.
4)
B) newton.
C) farad.
D) volt.
5) Several electrons are placed on a hollow conducting sphere. They
5)
A) clump together on the sphere's inner surface.
B) become uniformly distributed on the sphere's outer surface.
C) clump together on the sphere's outer surface.
D) become uniformly distributed on the sphere's inner surface.
6) A surface on which all points are at the same potential is referred to as
6)
A) a constant electric force surface.
B) an equivoltage surface.
C) an equipotential surface.
D) a constant electric field surface.
7) A negative charge is moved from point A to point B along an equipotential surface.
7)
A) The negative charge performs work in moving from point A to point B.
B) No work is required to move the negative charge from point A to point B.
C) Work is both required and performed in moving the negative charge from point A to point B.
D) Work is required to move the negative charge from point A to point B.
8) The energy acquired by a particle carrying a charge equal to that on the electron as a result of
moving through a potential difference of one volt is referred to as
A) an electron-volt.
B) a coulomb.
C) a joule.
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D) a proton-volt.
8)
9) The electron-volt is a unit of
A) power.
9)
B) current.
C) energy.
D) voltage.
10) One electron-volt corresponds to
A) 9.5 x 10-17 J.
10)
B) 1.6 x 10-19 j.
C) 8.0 x 10"20 J.
D) 1.9 x lO"^ J.
11) The absolute potential at a distance of 2.0 m from a positive point charge is 100 V. What is the
absolute potential 4.0 m away from the same point charge?
A) 400 V
B)25V
C)200V
11)
D)50V
12) Doubling the voltage across a given capacitor causes the energy stored in that capacitor to
A) quadruple.
B) double.
C) reduce to one fourth.
D) reduce to one half.
13) Doubling the capacitance of a capacitor holding a constant charge causes the energy stored in that
capacitor to
A) decrease to one half.
B) double.
C) decrease to one fourth.
D) quadruple.
12)
13)
14) A parallel-plate capacitor is connected to a battery and becomes fully charged. The capacitor is
then disconnected, and the separation between the plates is increased in such a way that no charge
leaks off. The energy stored in this capacitor has
A) decreased.
B) increased.
C) not changed.
D) become zero.
15) A dielectric material such as paper is placed between the plates of a capacitor holding a fixed
charge. What happens to the electric field between the plates?
A) becomes stronger
B) no change
C) reduces to zero
D) becomes weaker
16) A dielectric material such as paper is placed between the plates of a capacitor. What happens to
the capacitance?
A) becomes infinite
B) becomes smaller
C) no change
14)
15)
16)
D) becomes larger
17) The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they
are pulled apart. What happens to the strength of the electric field during this process?
17)
A) It decreases.
B) It increases.
C) It remains constant.
D) cannot be determined from the information given
18) The plates of a parallel-plate capacitor are maintained with constant voltage by a battery as they
are pulled apart. During this process, the amount of charge on the plates must
A) increase.
B) remain constant.
C) decrease.
D) either increase or decrease. There is no way to tell from the information given.
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18)
19) If the electric field between the plates of a given capacitor is weakened, the capacitance of that
capacitor
A) decreases.
B) increases.
C) does not change.
D) cannot be determined from the information given
20) Two parallel-plate capacitors are identical in every respect except that one has twice the plate area
of the other. If the smaller capacitor has capacitance C, the larger one has capacitance
A)C
B)4C
C)2C
D)C/2.
21) One coulomb per volt is a
A) joule.
19)
20)
21)
B) watt.
C) farad.
D) electron-volt.
22) Electric dipoles always consist of two charges that are
A) unequal in magnitude; opposite in sign.
B) equal in magnitude; opposite in sign.
C) equal in magnitude; both are negative.
D) equal in magnitude; both are positive.
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22)