Viewed from afar, the transit of Earth would cause the Sun's brightness to dim by approximately one part in
A) 100.
B) 1,000.
C) 10,000.
D) 100,000.
E) a million.
C
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A circular loop of wire is in the plane of the paper. The south pole of a bar magnet is being moved from a position in front of the paper in a direction away from the center of the loop. The direction of the induced current in the loop
A) is clockwise. B) is north. C) is counterclockwise. D) is south. E) cannot be determined.
A 100-W lamp glows brighter than a 25-W lamp. The electric resistance of the 100-W lamp is
A) less. B) greater. C) the same.
What happens to the amplitude of the induced emf when the rate of rotation of a generator coil is doubled?
1.It becomes four times larger. 2.It becomes two times larger. 3.It is unchanged. 4.It becomes one-half as large. 5.It becomes one-fourth as large.
Glaciers will retreat when the amount of accumulation
A) is less than the amount of ablation each year. B) exceeds the amount of ablation each year. C) is equal to the amount of ablation.