Finding the voltage using J and F? help T_T

[SAT2400]

Homework Statement

If 2.00 J are to be stored in a 10.0uF capacitor, what voltage must be applied to it??

Homework Equations

PE= .5 CV^2

The Attempt at a Solution

The answer is 632V...but I don't know how to get this answer...T_T

please help ASAP !

 

[maxiee]

You need to simply solve for V in your relevant equation, giving you

V=sqrt(PE*2/C)

Make sure not to confuse your PE with current density J. Reading your heading I made the assumption you had a question about current density.