Three originally uncharged infinite parallel planes are arranged as shown. Then the upper plate has surface charge density ? placed on it while the lower plate receives surface charge density ??. The net charge induced on the center plate is
A. 0.
B. ??/2.
C. +?/2.
D. ??.
E. +?.
Answer: A
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A brass rod of length L 5 0.75 m is twisted by torques T until the angle of rotation between the ends of the rod is 3.58. The allowable shear strain in the copper is 0.0005 rad. The maximum permissible diameter of the rod is approximately:
(A) 6.5 mm
(B) 8.6 mm
(C) 9.7 mm
(D) 12.3 mm
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