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Electric field in a spherical capacitor.

  1. Mar 16, 2015 #1
    1. The problem statement, all variables and given/known data

    The potential difference Δϕ between the plates of a spherical capacitor is kept constant. Show that then the electric field at the surface of the inner sphere will be a minimum if a=(1/2)b, find that minimum.
    Where: a=radius of the inner sphere, b=radius of the outside sphere.

    2. Relevant equations
    The potential difference between the plates is [tex]Δϕ=(Q/4πϵ_0)(1/b-1/a)[/tex]
     
    Last edited: Mar 16, 2015
  2. jcsd
  3. Mar 16, 2015 #2

    BvU

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    Hi Fel, welcome to PF :smile: !

    There is something special about the PF homework part you need to know: the guidelines require you present an attempt at solution !

    So no point in erasing part 3 of the template: we can't help until you show an effort!

    3. The attempt at a solution
    For a start, you might bring in an eqation for the electric field at the surface of the inner sphere, expressed in a and ##\Delta \phi##.
     
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