Electrostatics Question 283

Question: The plates of a parallel plate condenser are pulled apart with a velocity $ v $ . If at any instant their mutual distance of separation is $ d $ , then the magnitude of the time of rate of change of capacity depends on $ d $ as follows [MP PET 1991]

Options:

A) Zero

B) $ q/2 $

C) q

D) $ 2q $

Show Answer

Answer:

Correct Answer: A

Solution:

The $ \pm q $ charges appearing on the inner surfaces of A, are bound charges. As B is uncharged initially, as it is isolated, the charges on A will not be affected on closing the switch S. No charge will flow in to B.



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