The diagram below shows the position of a long straight wire perpendicular to the page and a set of directions labeled A through H. When the current in the wire is directed up out of the page, the direction of the magnetic field at point P is
A. D.
B. E.
C. F.
D. G.
E. H.
Answer: B
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The escape velocity at the event horizon around a black hole is
a. smaller than the speed of light. b. equal to the speed of light. c. much larger than the speed of light. d. irrelevant since nothing (including light) can escape from a black hole.
A solar cell has a light-gathering area of 10 cm2 and produces 0.2 A at 0.8 V (DC) when illuminated with S = 1 000 W/m2 sunlight. What is the efficiency of the solar cell?
a. 16% b. 7% c. 23% d. 4% e. 32%
Two equal positive charges are near each other. If we increase the amount of charge on just one of them, then
A. the strength of the electrical force on both decreases. B. the electric field points toward the larger charge. C. the electric field at the position of the smaller charge increases. D. the larger charge feels a stronger electrical force and the other a weaker electrical force.
Each of the following lists two statements. Which two are the basic premises for the special theory of relativity?
A) 1. The laws of nature are the same for everyone. 2. The speed of light is the same for everyone. B) 1. Everything is relative. 2. You can never really tell who is moving. C) 1. You can't go faster than the speed of light. 2. Time is different for different people. D) 1. The laws of nature are the same for everyone. 2. Everything is relative. E) 1. The speed of light is the same for everyone. 2. You can't go faster than the speed of light.