First slide

Capacitance

Question

Consider the situation shown in the figure. The capacitor A has a charge q on it whereas Bis uncharged. The charge appearing on the capacitor B a long time after the switch is closed is:

Easy

A

zero
B

q/2
C

q
D

2q

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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