A parallel-plate capacitor is constructed from two 8 cm 8

Question

Solve the all parts of following question:

Question: A parallel-plate capacitor is constructed from two 8 cm ? 8 cm electrodes spaced 1.0 mm apart. The capacitor plates are charged to ±8 nC, then disconnected from the battery.

Part A: How much energy is stored in the capacitor?

J

Part B: Insulating handles are used to pull the capacitor plates apart until the spacing is 2.3 mm. Now how much energy is stored in the capacitor?

J

Part C: How much work was done in the process of pulling the plates apart?

J

I need help to find how much energy is stored in the capacitor.