A coil is rotated in a magnetic field about an axis perpendicular to the field. During each rotation, how many times does the flux through the coil equal zero?
A. 0
B. 1
C. 2
D. 4
E. more than 4
C. 2
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If the rate of change of the magnetic field applied to a loop of wire is doubled, what happens to the induced emf in that loop assuming all the other parameters remain unchanged?
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A bowling ball of mass 7.5 kg and radius 9.0 cm rolls without slipping 10 m down a lane at 4.3 m/s
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Half-way to the center of a completely hollow planet with a thin uniform shell, your weight would be
A) one-quarter of your weight on the surface. B) one-half of your weight on the surface. C) three-quarters of your weight on the surface. D) the same as at the surface. E) zero.