Points A [at (2, 3) m] and B [at (5, 7) m] are in a region where the electric field is uniform and given by 
N/C. What is the potential difference VA?VB?
A. 33 V
B. 27 V
C. 30 V
D. 24 V
E. 11 V
Answer: D
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Which of the following is not a general difference between a planet and a star?
A) Planets are smaller than stars. B) Planets are dimmer than stars. C) All planets are made of rock and all stars are made of gas. D) Planets orbit stars, while stars orbit the center of the galaxy.
Electrical polarization occurs when
a. An electron is at a different location than a proton. b. Charge distribution in a neutral molecule separates. c. The electron and the proton are on different sides of an atom. d. An atom vibrates in a single direction. e. None of the above.
If the volume of an object were to be halved with the same mass, its density would
a. halve b. double c. stay the same
A lens that is thicker at the center than the edges
a. is a converging lens b. is a diverging lens c. always forms a real image d. always forms a virtual image e. none of the above