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Electrostatics - parallel plate capacitor

  1. Jul 7, 2009 #1
    Two parallel uniform charged circular conducting metal disks contains a charge of +Q and -Q on the inner surfaces, and little amounts of charge +q and -q on the outer surfaces. The detail is shown in the diagram.
    Each plate has a radius R and thickness t. The separation of the plates is d.

    Question: How much charge q is on the outside surface of the disk. The answer is in terms of Q and without the approach by Gauss's law.
    Hint: E-field of a uniformly charged disk of radius R a distance z from the center of the disk is as following equation.

    Please help to solve this problem. It is strange to me that the outer surface carries certain amount of charges.
     

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  2. jcsd
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