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Do you know how to find the capacitance when charge and voltage are given?

Anyway, use q=C*V to find C. Plug it into E=1/2*C*V^2.

are you sure from this laws :D I applied this rules and the answer is wrong :S

0.48 mJ
58 mJ
0.12 J
0.90 GJ
0.36 J

yes

when i followed @arcticf0x's method, i got 57.6 mJ

I got 5.76x10^10

so it will be 58 mj

yes

thnx :)

http://www.wolframalpha.com/input/?i=1%2F2*%2880*10^%28-6%29%2F10%29*120^%282%29

thnx :)

i don't understand the answer i have the same question

Apply this Ahmed q=C*V to find C. Plug it into E=1/2*C*V^2. Then you will get 57.6 mJ