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(A) The energy stored in a capacitor is given by the formula $U = \frac{Q^2}{2C}$.When a charged capacitor is disconnected from the battery,the charge

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Increases

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(A) The energy stored in a capacitor is given by the formula $U = \frac{Q^2}{2C}$.When a charged capacitor is disconnected from the battery,the charge $Q$ on its plates remains constant.The capacitance $C$ of a parallel plate capacitor is given by $C = \frac{\epsilon_0 A}{d}$,where $d$ is the separation between the plates.As the plate separation $d$ increases,the capacitance $C$ decreases because $C \propto \frac{1}{d}$.Since $U = \frac{Q^2}{2C}$ and $C$ is in the denominator,a decrease in $C$ leads to an increase in the stored energy $U$.Therefore,the energy increases.

On increasing the plate separation of a charged condenser,the energy

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