An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d.This capacitor is connected to a battery and charged until its plates carry charges +Q and -Q,and the battery is then disconnected.If the separation between the plates is now doubled,the electrical energy stored in the capacitor will

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The energy stored in a capacitor is given by U = (1/2)CV^2, where C is the capacitance and V is the voltage. The capacitance of a parallel-plate capacitor is given by C = epsilon_0 * A / d, where epsilon_0 is the permittivity of free space. If the separation between the plates is doubled, the capacitance will be halved. However, the voltage across the capacitor will remain the same, since the battery has been disconnected. Therefore, the energy stored in the capacitor will be halved.

An Ideal Parallel-Plate Capacitor Consists of Two Parallel Plates of Area