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Homework Help: 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.

    Attached Files:

  2. jcsd
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