# Calculating Energe stored in a Parallel Plate Capacitor

1. Jun 15, 2011

### abigailb55

The left plate of a parallel plate capacitor carries a positive charge Q, and the right plate carries a negative charge -Q. The magnitude of the electric field between the plates is 100 kV/m. The plates each have an area of 2 × 10-3 m2, and the spacing between the plates is 6 × 10-3 m. There is no dielectric between the plates.

Calculate the energy stored in the capacitor.

I believe this is the relevant equation:
(1/2)((ke0A)/d)(Ed)^2

I really don't know what to do with this

2. Jun 15, 2011

### ojs

The equation look alright except for the k before $\epsilon_0$.

To know what to do with this equation you have to know what each letter in it represents, know the connection between the letters and the information given in the problem, do you know them?