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Metal Sphere surrounded by dielectric

  1. Oct 24, 2011 #1
    It is Example 4.5 in Griffiths intro to Electrodynamics.

    A metal sphere of radius a carries a charge Q. It is surrounded, out to radius b, by linear dielectric material of permittivity epsilon ....

    He goes on to say that E = P = D = 0 inside the sphere. I understand that D = 0 inside, but why is E = 0? Is the polarization of the dielectric pulling all of the charge inside the sphere to the surface? I really don't understand :(.
  2. jcsd
  3. Oct 24, 2011 #2

    rude man

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    If it's a metal sphere,where are the charges ALWAYS congregated, assuming a static situation? And why?
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