When a 4-?F capacitor has a potential drop of 20 V across its plates, how much electric potential energy is stored in this capacitor?
A) 0.8 ?J
B) 8 ?J
C) 80 ?J
D) 800 ?J
E) 8000 ?J
D
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Points A [at (3, 6) m] and B [at (8, ?3) m] are in a region where the electric field is uniform and given by 
N/C. What is the electric potential difference VA?VB?
A. +60 V B. ?60 V C. +80 V D. ?80 V E. +50 V
In a reference frame floating in space, which do you think follows the straighter path?
A. The earth B. The moon C. The center of mass of the earth/moon system
A proton is released from rest at the origin in a uniform electric field in the positive x direction with magnitude 850 N/C. What is the change in the electric potential energy of the proton–field system when the proton travels to x = 2.50 m?
1.3.40 × 10^-16 J 2.-3.40 × 10^-16 J 3.2.50 × 10^-16 J 4.-2.50 × 10^-16 J 5.-1.60 × 10^-19 J
Water waves pass by a piece of cork floating on the water that bobs up and down one complete cycle each second. The waves are 2 meters long. What is the speed of the wave?
A) 0.25 m/s B) 0.50 m/s C) 1.0 m/s D) 2 m/s E) 4 m/s