Question

If the potential difference across a capacitor is doubled, what happens to: (a) the charge on the capacitor and (b) the energy stored in the capacitors.

Answer 1

(a)Charge, C=Q/V

As C is constant and Q is proportional to V

Hence, charge also gets doubled

(b)Energy, E=1/2 CV²

Energy is directly proportional to

square of Potential Difference

Hence, E becomes four times.

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