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Homework Help: Conductor in Capacitor Problem

  1. Sep 8, 2009 #1
    1. The problem statement, all variables and given/known data

    An isolated capacitor with capacitance C = 1 µF has a charge Q = 22 µC on its plates.
    Now a conductor is inserted into the capacitor. The thickness of the conductor is 1/3 the thickness of the capacitor and is centered in between the plates of the capacitor.

    What is the capacitance of the capacitor with the conductor in place?

    2. Relevant equations

    Q = C / V

    V = E d

    3. The attempt at a solution

    I know that since the capacitor is a conductor it makes the distance between the two plates smaller which means that the capacitance should therefore increase. I thought that since we now had two distances that were each 1/3 the original distance the capacitance would increase by a factor of 6 however this answer does not work. Can anyone help me please?!?
  2. jcsd
  3. Sep 8, 2009 #2


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    Homework Helper

    After introduction of conductor, each capacitor is three times the original capacitor. Now these two capacitors are in series. Then what will be the combined capacitor?
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