anonymous
  • anonymous
When a capacitor has a charge of absolute value 80 µC on each plate the potential difference across the plates is 10 V. How much energy is stored in this capacitor when the potential difference across its plates is 120 V?
Physics
katieb
  • katieb
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anonymous
  • anonymous
Do you know how to find the capacitance when charge and voltage are given?
anonymous
  • anonymous
Anyway, use q=C*V to find C. Plug it into E=1/2*C*V^2.
anonymous
  • anonymous
are you sure from this laws :D I applied this rules and the answer is wrong :S

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anonymous
  • anonymous
0.48 mJ 58 mJ 0.12 J 0.90 GJ 0.36 J
anonymous
  • anonymous
@pully, are these the options?
anonymous
  • anonymous
yes
anonymous
  • anonymous
when i followed @arcticf0x's method, i got 57.6 mJ
anonymous
  • anonymous
I got 5.76x10^10
anonymous
  • anonymous
so it will be 58 mj
anonymous
  • anonymous
yes
anonymous
  • anonymous
thnx :)
anonymous
  • anonymous
http://www.wolframalpha.com/input/?i=1%2F2*%2880*10^%28-6%29%2F10%29*120^%282%29
anonymous
  • anonymous
thnx :)
anonymous
  • anonymous
i don't understand the answer i have the same question
anonymous
  • anonymous
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

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