Aparallel-plate capacitor has plate area a. a battery is used to charge the capacitor so that the magnitude of charge on each plate is q, and then is disconnected. initially, the capacitor has a plate separation of d. at this separation the capacitor contains energy u. the plates are then moved to a separation of 2d without disturbing the charge. what is the energy of the capacitor at this larger plate separation?

When we double the separation between the plates of the capacitor the electric Energy is doubled too.

Explanation:

First we analyse the Capacitance.

Initial:

Final:  

Energy:

Initial:

Initial:

When we double the separation between the plates of the capacitor the Energy electric is doubled too.

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