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

Multiple Choice

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

A) quadruple.
B) be cut in fourth.
C) not change.
D) double.
E) be cut in half.