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1.
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The diagram below shows two lines of equipotential in a region of a uniform
electric field. Line X has a potential of +50 V and line Y has a potential of +100V. The distance
between X and Y is 2.0 cm.
Which one of the following correctly gives the direction of the electric field and its
strength?
Direction Strength
/ V cm–1 A. | X ® Y
100 | B. | Y ® X
100 | C. | Y ® X
25 | D. | X ® Y
25 |
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2.
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The diagram below shows electric field lines in a region of space. Which of the following diagrams best
shows the variation with distance d of the potential V along the line XY?
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3.
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X and Y are two points in an electric field. The potentials at X and Y are
VX and VY respectively where VX >
VY. A small, positive test charge +q is placed at X.
Which of the
following is the work done per unit charge by the electric field on the charge as the charge
moves from point X to point Y?
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4.
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The diagram below shows the electric field lines in a region of space. A
positively charged particle moves from P to Q.  Which of the following is correct?
Change in
potential energy of particle Change in
potential between P and QA. |
decreases
negative | B. |
decreases
zero | C. |
increases
negative | D. |
increases
zero |
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5.
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The
diagram above shows an isolated, positive charge Q. Point B is twice as far away from
Q as point A. The ratio of the electric field strength at point A to the
electric field strength at point B isA. | 8 to 1 | C. | 1 to
1 | B. | 2 to 1 | D. | 4 to
1 |
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6.
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A hollow metal sphere of radius R is
positively charged. Of the following distances from the center of the sphere, which location will
have the greatest electric field strength?
A. | 2R | C. |  | B. |  | D. | O (center of the sphere) |
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7.
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Two identical
conducting spheres are charged to +2 Q and - Q, respectively, and are separated by a
distance d (much greater than the radii of the spheres) as shown above. The magnitude of the
force of attraction on the left sphere is  . After the two spheres are
made to touch and then are reseparated by distance d, the magnitude of the force on the left
sphere is  . Which of the following relationships is
correct?
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8.
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Which of the following is true about the net force
on an uncharged conducting sphere in a uniform electric field?
A. | It is in the direction of the
field. | B. | It is zero. | C. | It causes the sphere to oscillate about an equilibrium
position. | D. | It produces a torque on the sphere about the direction
of the field. |
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9.
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Two charges of –e
and +4e are fixed at the positions shown below. At which position along the line XY
is the electric field due to these charges equal to zero?
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10.
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Three equal point charges X, Y and Z are fixed in the positions shown. The distance between
q1 and q2 and the distance between q2 and
q3 is 1.0 m. The electric force between the charges at X and Y is F. The
electric force between the charges at X and Z is A. |  | C. | F | B. |  | D. | 2F. |
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11.
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The electron volt is defined as
A. | a unit of energy exactly equal to 1.6 × 10–19
J. | B. | a fraction  of the ionization energy of atomic
hydrogen. | C. | the energy gained by an electron when it moves through a potential difference of 1.0
V. | D. | the energy transfer when 1.0 C of charge moves through a potential difference of 1.0
V. |
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12.
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Which of the following is the correct value of the electronvolt, measured in SI
Units?
A. | 1.6 ´ 10–19 N | C. | 9.1 ´ 10–31 N | B. | 1.6 ´
10–19 J | D. | 9.1 ´ 10–31
J |
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13.
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A parallel-plate capacitor has a capacitance  . A second
parallel-plate capacitor has plates with twice the area and twice the separation. The capacitance of
the second capacitor is most nearly
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