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Energy between a capacitor

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  1. Jan 30, 2016 #1
    A capacitor is connected to a battery. If a person pulls the plate to increase the distance by 2d the decrease in energy between the plates is E. We observe energy gained by battery is 2E. From where does extra energy E come from.?
     
  2. jcsd
  3. Jan 30, 2016 #2

    Dale

    Staff: Mentor

    Where do you think it came from. Can you think of any quantity that is equal to the change in energy?
     
  4. Jan 30, 2016 #3
    i think extra E came because of work done by external force
     
  5. Jan 30, 2016 #4

    Dale

    Staff: Mentor

    Yes, exactly!
     
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