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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
    σ=Q/(4*pi*R^2)
    k=1/(4*pi*epsilon_0)


    3. The attempt at a solution
    (4*pi*k*R*σ)/((R+x)^2)
     
  2. jcsd
  3. Jan 26, 2014 #2

    SammyS

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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?

    Note:
    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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