A student has made the statement that the electric flux through one half of a Gaussian surface is always equal and opposite to the flux through the other half of the Gaussian surface. This is
A. never true.
B. never false.
C. true whenever enclosed charge is symmetrically located at a center point, or on a center line or centrally placed plane.
D. true whenever no charge is enclosed within the Gaussian surface.
E. true only when no charge is enclosed within the Gaussian surface.
Answer: E
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If all potatoes are selling at the same price per kilogram, a housewife who plans to peel the potatoes would get more potato for her money if she bought
1) small potatoes. 2) medium potatoes. 3) large potatoes. 4) no difference. This is because she 5) would get more potatoes per kilogram. 6) would get less potatoes per kilogram. 7) would get less peelings because of less surface area per pound. 8) buys weight, so any size per kilogram gives the same mass of potatoes.
The resistance of a wire increases 3.9% when the temperature of the wire is raised 100 
C What is the temperature coefficient of resistivity of the wire material?
A. 3.9
B. 0.39
C. 0.039
D. 0.0039
E. 0.00039
Energy in Capacitors: An air-filled 20-?F capacitor has a charge of 60 ?C on its plates. How much energy is stored in this capacitor?
A. 70 ?J B. 80 ?J C. 90 ?J D. 100 ?J E. 110 ?J
Figure C9.12 shows the potential energy function for a certain interaction. This interaction is
A. Always attractive. B. Always repulsive. C. Attractive for small r, but repulsive for large r. D. Repulsive for small r, but attractive for large r.