Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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An
attracting force occurs between two charged objects when the charges are of a. | unlike
signs. | c. | equal
magnitude. | b. | like signs. | d. | unequal magnitude. | | | | |
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2.
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When
a glass rod is rubbed with silk and becomes positively charged, a. | electrons are
removed from the rod. | c. | protons are
added to the silk. | b. | protons are removed from the
silk. | d. | the silk remains
neutral. | | | | |
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3.
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If a
positively charged glass rod is used to charge a metal bar by induction, the charge on the
bar a. | will be equal in
magnitude to the charge on the glass rod. | b. | must be negative. | c. | must be
positive. | d. | will be greater in magnitude than the charge on the glass
rod. | | |
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4.
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In
the diagram shown above, the circles represent small balls that have electric charges. Ball 1 has a
negative charge, and ball 2 is repelled by ball 1. Next, you see that ball 2 repels ball 3 and that
ball 3 attracts ball 4. What is the electric charge on ball 4? a. | Ball 4 may have
either a positive or negative charge. | b. | Ball 4 has a negative charge. | c. | Ball 4 has a
positive charge. | d. | It is not possible to determine the charge on ball
4. | | |
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5.
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Which
sentence best describes electrical conductors? a. | Electrical conductors have low mass
density. | b. | Electrical conductors have high tensile
strength. | c. | Electrical conductors have electric charges that move
freely. | d. | Electrical conductors are poor heat
conductors. | | |
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6.
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Which
statement is the most correct regarding electric insulators? a. | Charges within
electric insulators do not readily move. | b. | Electric insulators have high tensile
strength. | c. | Electric charges move freely in electric
insulators. | d. | Electric insulators are good heat
conductors. | | |
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7.
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The
process of charging a conductor by bringing it near another charged object and then grounding the
conductor is called a. | contact charging. | c. | polarization | b. | induction. | d. | neutralization. | | | | |
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8.
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The
figure shown above demonstrates charging by a. | grounding. | c. | polarization. | b. | induction. | d. | contact. | | | | |
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9.
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Both
insulators and conductors can be charged by a. | grounding. | c. | polarization. | b. | induction. | d. | contact. | | | | |
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10.
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A
surface charge can be produced on insulators by a. | grounding. | c. | polarization. | b. | induction. | d. | contact. | | | | |
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11.
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Conductors can be charged by ____, while insulators cannot. a. | grounding | c. | polarization | b. | induction | d. | contact | | | | |
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12.
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Which
of the following is not true for both gravitational and electric forces? a. | The inverse
square distance law applies. | b. | Forces are proportional to physical
properties. | c. | Potential energy is a function of distance of
separation. | d. | Forces are either attractive or
repulsive. | | |
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13.
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Two
point charges, initially 2 cm apart, are moved to a distance of 10 cm apart. By what factor does the
resulting electric force between them change?
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14.
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Two
point charges, initially 1 cm apart, are moved to a distance of 3 cm apart. By what factor do the
resulting electric and gravitational forces between them change?
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15.
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Two
positive charges, each of magnitude q, are on the y-axis at points y = +a
and y = –a. Where would a third positive charge of the same magnitude be located
for the net force on the third charge to be zero? a. | at the origin | c. | at y = –2a | b. | at y =
2a | d. | at y =
–a | | | | |
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16.
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Where
is the electric field of an isolated, uniformly charged, hollow metallic sphere
greatest? a. | at the center of
the sphere | c. | at
infinity | b. | at the sphere’s inner
surface | d. | at the
sphere’s outer surface | | | | |
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17.
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A
conductor that is in electrostatic equilibrium has an electric field inside the conductor
that a. | depends on the
radius of the conductor. | b. | is zero. | c. | is greatest near
the conductor’s surface. | d. | is parallel to the surface of the
conductor. | | |
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18.
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The
electric field just outside a charged conductor in electrostatic equilibrium is a. | zero. | b. | at its minimum level. | c. | the same as it
is in the center of the conductor. | d. | perpendicular to the conductor’s
surface. | | |
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19.
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For a
conductor that is in electrostatic equilibrium, any excess charge a. | flows to the
ground. | b. | resides entirely on the conductor’s outer
surface. | c. | resides entirely on the conductor’s
interior. | d. | resides entirely in the center of the
conductor. | | |
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20.
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If an
irregularly shaped conductor is in electrostatic equilibrium, charge accumulates a. | where the radius
of curvature is smallest. | b. | where the radius of curvature is
largest. | c. | evenly throughout the conductor. | d. | in flat
places. | | |
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