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Homework Help: Cylindrical Capacitor

  1. Feb 6, 2017 #1
    1. The problem statement, all variables and given/known data

    Normally this style of question wouldn't be too bad, however the 2 different parts confused me. Surely once set to a potential V, it would stay at that potential - it doesn't need to stay connected

    How are the 2 parts any different from each other?
  2. jcsd
  3. Feb 6, 2017 #2


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    Staff: Mentor

    Withdrawing the inner cylinder changes the capacitance. If the charge is fixed (no external connection), how does potential difference vary when capacitance varies?

    Note that this is similar to the problem where a parallel plate capacitor has its plate separation varied while either connected to, or not connected to, a voltage source.
  4. Feb 6, 2017 #3
    ahh, so its charged up, disconnected and then withdrawn? I guess if it were withdrawn before being charges it would be the same as a smaller capacitor
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