Download Exam C,UAG Name MULTIPLE CHOICE. Choose the one

Exam
C,UAG
Name__________________________________
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
1) Is it possible for two negative charges to attract each other?
1)
A) No, they will never attract.
B) Yes, they always attract.
C) Yes, they will attract if they are close enough.
D) Yes, they will attract if one carries a larger charge than the other.
2) A glass rod is rubbed with a piece of silk. During the process the glass rod acquires a positive
charge and the silk
2)
A) acquires a positive charge also.
B) could either be positively charged or negatively charged. It depends on how hard the rod was rubbed.
C) remains neutral.
D) acquires a negative charge.
3) The model of the atom shows a
3)
A) nucleus consisting of both protons and electrons, surrounded by a cloud of neutrons
B) nucleus consisting of both electrons and neutrons, surrounded by a cloud of protons.
C) neutrally charged nucleus surrounded by both protons and electrons.
D) nucleus consisting of both protons and neutrons, surrounded by a cloud of electrons.
4) A neutral atom always has
4)
A) more protons than electrons.
B) the same number of neutrons as protons.
C) more neutrons than protons.
D) the same number of protons as electrons.
5) Materials in which the electrons are bound very tightly to the nuclei are referred to as
A) semiconductors.
B) insulators.
C) superconductors.
D) conductors.
5)
6) Materials in which the electrons are bound very loosely to the nuclei and can move about freely
within the material are referred to as
A) conductors.
B) semiconductors.
C) insulators.
D) superconductors.
7) How can a negatively charged rod charge an electroscope positively?
A) by deduction
B) by induction
C) by conduction
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6)
7)
D) It cannot.
8) An originally neutral electroscope is briefly touched with a positively charged glass rod. The
electroscope
8)
A) becomes positively charged.
B) could become either positively or negatively charged, depending on the time of contact.
C) remains neutral.
D) becomes negatively charged.
9) An originally neutral electroscope is grounded briefly while a positively charged glass rod is held
near it. After the glass rod is removed, the electroscope
9)
A) is negatively charged.
B) is positively charged.
C) could be either positively or negatively charged, depending on how long the contact with ground
lasted.
D) remains neutral.
10) Charge is
10)
A) quantized.
B) invariant.
C) conserved.
D) all of the given answers
11) Two charged objects are separated by a distance d. The first charge is larger in magnitude than the
second charge.
11)
A) The second charge exerts a larger force on the first charge.
B) The charges exert forces on each other equal in magnitude and opposite in direction.
C) The first charge exerts a larger force on the second charge.
D) The charges exert forces on each other equal in magnitude and pointing in the same direction.
12) Two charged objects attract each other with a certain force. If the charges on both objects are
doubled with no change in separation, the force between them
12)
A) halves.
B) doubles.
C) quadruples.
D) increases, but we can't say how much without knowing the distance between them.
13) An electron and a proton are separated by a distance of 1.0 m. What happens to the magnitude of
the force on the proton if a second electron is placed next to the first electron?
A) It doubles.
B) It will not change.
C) It goes to zero.
D) It quadruples.
14) An electron and a proton are separated by a distance of 1.0 m. What happens to the magnitude of
the force on the first electron if a second electron is placed next to the proton?
A) It doubles.
B) It becomes zero.
C) It is reduced to half.
D) It does not change.
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13)
14)
15) A point charge of +Q is placed at the centroid of an equilateral triangle. When a second charge of
15) +Q is
placed at one of the triangle's vertices, an electrostatic force of 4.0 N acts on it. What is the magnitude of the force
that acts on the center charge due to a third charge of +Q placed at one of the other vertices?
+Q
Stt
*
*
*
t
/
t
\
\
%
%
®
/
\
+Q
t
+Q®
FIGURE 16-1
A) zero
B) 4.0 N
C)16N
D)8.0N
16) Which of the following is not a vector?
16)
A) electric line of force
B) electric field
C) electric charge
D) electric force
17) At twice the distance from a point charge, the strength of the electric field
A) is one-half its original value.
B) is twice its original value.
C) is four times its original value.
D) is one-fourth its original value.
17)
18) Is it possible to have a zero electric field value between a negative and positive charge along the
line joining the two charges?
18)
A) No, a zero electric field cannot exist between the two charges.
B) Yes, if the two charges are equal in magnitude.
C) Yes, regardless of the magnitude of the two charges.
D) cannot be determined without knowing the separation between the two charges
19) Is it possible to have a zero electric field value between two positive charges along the line joining
the two charges?
19)
A) No, a zero electric field cannot exist between the two charges.
B) Yes, if the two charges are equal in magnitude.
C) Yes, regardless of the magnitude of the two charges.
D) cannot be determined without knowing the separation between the two charges
20) Electric field lines near psitive point charges
20)
A) circle counter-clockwise.
B) radiate inward.
C) circle clockwise.
D) radiate outward.
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21) Can electric field lines intersect in free space?
21)
A) Yes, but only at the midpoint between two equal like charges. B)No.
C) Yes, but only at the centroid of an equilateral triangle with like charges at each corner.
D) Yes, but only at the midpoint between a positive and a negative charge.
22) A solid block of metal in electrostatic equilibrium is placed in a uniform electric field. Give a
statement concerning the electric field in the block's interior.
22)
A) The interior field points in a direction opposite to the exterior field.
B) There is no electric field in the block's interior.
C) The interior points in a direction that is parallel to the exterior field.
D) The interior field points in a direction that is at right angles to the exterior field.
23) A cubic block of aluminum rests on a wooden table in a region where a uniform electric field is
directed straight upward. What can be said concerning the charge on the block's top surface?
23)
A) The top surface is charged negatively.
B) The top surface is charged positively.
C) The top surface is neutral.
D) The top surface's charge cannot be determined without further information.
24) If a conductor is in electrostatic equilibrium near an electric charge
A) the total electric field of the conductor must be zero.
B) the force between the conductor and the charge must be zero.
C) the electric field on the surface of the conductor is perpendicular to the surface.
D) the total charge on the conductor must be zero.
25) A positive point charge is enclosed in a hollow metallic sphere that is grounded. As compared to
25)
the case without the hollow sphere, the electric field at a point directly above the hollow sphere has
A) increased somewhat.
B) diminished somewhat.
C) diminished to zero.
D) not changed.
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24)