The length of a certain wire is doubled and at the same time its radius is also doubled. What is the change in the resistance of this wire?
A) It stays the same.
B) It is doubled.
C) It is quadrupled.
D) It is reduced by a factor of 2.
E) It is reduced by a factor of 4.
D
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Which of the following is true of Venus?
A) Its atmosphere is transparent to visible light. B) Its atmosphere is transparent to infrared radiation. C) Its atmosphere is as dense as that of Earth. D) Its atmosphere is mostly composed of carbon dioxide.
Significant Figures: What is 
expressed to the correct number of significant figures?
Fill in the blank(s) with the appropriate word(s).
Conductors: A solid aluminum cube rests on a wooden table in a region where a uniform external electric field is directed straight upward. What can we say concerning the charge on the top surface of the cube?
A. The top surface is charged positively. B. The top surface is charged negatively. C. The top surface is neutral. D. The top surface's charge cannot be determined without further information.
A series RLC circuit has a 100-? resistor, a 0.100-?F capacitor, and a 2.00-mH inductor connected across a 120 V rms ac source operating at resonant frequency. What is the rms value of the voltage across the inductor?
A) 170 V B) 150 V C) 120 V D) 54.0 V E) 533 V