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pully

  • 4 years ago

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?

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

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

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

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

  5. rajathsbhat
    • 4 years ago
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    @pully, are these the options?

  6. pully
    • 4 years ago
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    yes

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

  8. pully
    • 4 years ago
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    I got 5.76x10^10

  9. pully
    • 4 years ago
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    so it will be 58 mj

  10. rajathsbhat
    • 4 years ago
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    yes

  11. pully
    • 4 years ago
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    thnx :)

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

  13. pully
    • 4 years ago
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    thnx :)

  14. ahmedanbar
    • 4 years ago
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    i don't understand the answer i have the same question

  15. pully
    • 4 years ago
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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

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