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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The diagram below shows the arrangement of three charged hollow metal spheres,
A, B, and C. The arrows indicate the direction of the electric forces acting between the spheres. At
least two of the spheres are positively charged.  Which sphere, if any,
could be negatively charged? a. | sphere A | c. | sphere C | b. | sphere B | d. | no sphere |
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2.
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What is the magnitude of the electrostatic force acting on an electron located
in an electric field having a strength of 5.0 ×103 newtons per coulomb? _____
a. | 3.1 ×1022 N | c. | 8.0 ×10–16 N
| b. | 5.0 ×103 N | d. | 3.2 ×10–23 N |
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3.
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A charge of 5.0 coulombs moves through a circuit in 0.50 second. The current in
the circuit is _____.
a. | 2.5 A | c. | 7.0 A | b. | 5.0 A | d. | 10. A |
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4.
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An operating electric iron draws a current of 5 amperes and has a resistance of
20 ohms. The amount of energy used by the iron in 40 seconds is _____
a. | 1 ×102 J | c. | 4 ×103 J
| b. | 5 ×102 J | d. | 2 ×104 J |
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5.
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What is the net static electric charge on a metal sphere having an excess of +3
elementary charges? _____
a. | 1.60 ×10–19 C | c. | 3.00 ×100 C
| b. | 4.80 ×10–19 C | d. | 4.80 ×1019
C |
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6.
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The diagram below shows proton P located at point A near a positively charged
sphere.  If 6.4 ×10
–19 joule of work is required to move the proton from point A to point B, the
potential difference between A and B is _____ a. | 6.4 ×10–19 V | c. | 6.4 V | b. | 4.0
×10–19 V | d. | 4.0 V |
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7.
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An electrostatic force of magnitude F exists between two metal spheres having
identical charge q. The distance between their centers is r. Which combination of changes would
produce no change in the electrostatic force between the spheres? _____
a. | doubling q on one sphere while doubling r | b. | doubling q on both
spheres while doubling r | c. | doubling q on one sphere while halving r
| d. | doubling q on both spheres while halving r |
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8.
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Which graph best represents the relationship between the potential difference
across a conductor and the current through the conductor at constant temperature? _____
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9.
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While operating at 120 volts, an electric toaster has a resistance of 15 ohms.
The power used by the toaster is _____.
a. | 8.0 W | c. | 960 W | b. | 120 W | d. | 1,800 W |
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