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pully

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?

  • one year ago
  • one year ago

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  1. arcticf0x
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    Do you know how to find the capacitance when charge and voltage are given?

    • one year ago
  2. arcticf0x
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    Anyway, use q=C*V to find C. Plug it into E=1/2*C*V^2.

    • one year ago
  3. pully
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    are you sure from this laws :D I applied this rules and the answer is wrong :S

    • one year ago
  4. pully
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    0.48 mJ 58 mJ 0.12 J 0.90 GJ 0.36 J

    • one year ago
  5. rajathsbhat
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    @pully, are these the options?

    • one year ago
  6. pully
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    yes

    • one year ago
  7. rajathsbhat
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    when i followed @arcticf0x's method, i got 57.6 mJ

    • one year ago
  8. pully
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    I got 5.76x10^10

    • one year ago
  9. pully
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    so it will be 58 mj

    • one year ago
  10. rajathsbhat
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    yes

    • one year ago
  11. pully
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    thnx :)

    • one year ago
  12. arcticf0x
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    http://www.wolframalpha.com/input/?i=1%2F2*%2880*10^%28-6%29%2F10%29*120^%282%29

    • one year ago
  13. pully
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    thnx :)

    • one year ago
  14. ahmedanbar
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    i don't understand the answer i have the same question

    • one year ago
  15. pully
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    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

    • one year ago
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