A current of 5 A is flowing in a 20 mH inductor. The energy stored in the magnetic field of this inductor is
A)
1 J.
B)
0.25 J.
C)
0.50 J.
D)
0.
E)
dependent upon the resistance of the inductor.
B
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What did Becquerel discover about uranium?
a. That some uranium salts fluoresced in sunlight. b. That all uranium salts fluoresced in sunlight. c. That X rays striking some uranium salts produced visible light. d. That fluorescent light can pass right through the light proof covering used then for photographic plates. e. That all uranium salts would expose photographic film with or without exposure to light.
Because the earth's orbit is slightly elliptical, the earth actually gets closer to the sun during part of the year. When the earth is closer to the sun its orbital speed is
A) less than when the earth is farthest away from the sun. B) the same as when the earth is farthest away from the sun. C) greater than when the earth is farthest away from the sun.
Alice bungee-jumps from a bridge above a deep gorge. Bob watches from the bridge. Let event D be Alice’s departure from Bob’s location on the bridge, and event R be her return to Bob’s location on the bridge. Carol observes these events from a a train passing over the bridge, and uses synchronized clocks on the train to measure the time between Alice’s departure and return. Which person’s watch or clocks register(s) a proper time between events D and R?
A. Alice B. Bob C. Carol D. Alice and Bob E. Bob and Carol F. Alice and Carol T. All three observers