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Homework Help: Electric field of a spherical metal shell

  1. Jan 26, 2014 #1
    1. The problem statement, all variables and given/known data
    A spherical metal shell has charge per unit area sigma and radius R. What is the magnitude of the electric field at a distance x from the surface of the sphere? You may include only these variables in your formula: sigma, R, epsilon_0, x

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Jan 26, 2014 #2


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    That looks good, but I think the problem calls for you to use ε0 rather than k .
  4. Jan 26, 2014 #3

    Simon Bridge

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    Cool! Was there a question in there?

    Your reasoning and working is usually helpful to answering questions.
    The permittivity of free space is an allowed "variable" but it is actually a constant ...
    I take it you used k to save typing?
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