A capacitor of capacitance is charged to and then isolated from the battery

PHYSICS · Subjective · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

A capacitor of capacitance

5\,\mu\text{F}

is charged to

100\,\text{V}

and then isolated from the battery. Its plate separation is now increased so that its capacitance becomes

2\,\mu\text{F}

. Determine the energy stored in the capacitor after the plates are moved apart.