A 20-mF capacitor is attached across a 1000-V power supply. What is the net charge on the capacitor?
a. 20 mC
c. 10 mC
b. 40 mC
d. none of these choices
D
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What is the magnitude of the acceleration of an electron when in an electric field of 
A. 
B. 
C. 
D. 
E. 
A. The divergence is positive. B. The divergence is negative. C. The divergence is zero.
A plastic ball in a liquid is acted upon by its weight and by a buoyant force. The weight of the ball is NaN N. The buoyant force has a magnitude of NaN N and acts vertically upward
An external force acting on the ball maintains it in a state of rest. The external force, including direction, is closest to: A) NaN N, downward B) NaN N, upward C) NaN N, upward D) NaN N, upward E) NaN N, downward
A seismograph
A) predicts earthquakes. B) measures ground movement. C) helps prevent earthquakes. D) measures fault displacement.