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Homework Help: Potential due to two infinite parallel planes

  1. Mar 4, 2006 #1
    Consider two infinite parallel planes of charge, one in the yz plane and the other at distance x = a. (a) Find
    the potential everywhere in space when V = 0 at x = 0 if the planes carry equal positive charge densities + σ. (b)
    Repeat the problem with charge densities equal and opposite, and the charge in the yz plane positive.


    I haven't had any problems with part a. As for part b, E=0 if x > a (the field lines of both planes cancel) , so I figured the potential needs to be 0 too, but the answer should be V= [tex]\frac{- \sigma a}{\epsilon_0}.[/tex] Why is that?

    EDIT: I just figured it out by myself :)
     
    Last edited: Mar 4, 2006
  2. jcsd
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