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## Homework Statement

Q18. A 20 F capacitor is charged to 200 V. Its stored energy is:

C. 0.4 J

## Homework Equations

q = CV

u = .5CV^2

## The Attempt at a Solution

I tried plugging in the numbers and got 1.6E6, which isn't even close to the answer. I really don't know where to go with this one. I even went and found an energy calculator online and it came up with the same answer I got. Is stored energy not the potential energy of the capacitor?