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The electric field inside the body of a conductor in electrostatic equilibrium is

  • A.uniform and directed from the surface toward the centre
  • B.equal to the surface charge density divided by the permittivity
  • C.the same as the field just outside its surface
  • D.zero

Answer: D

Any field within the metal would drive a current, and in equilibrium none flows, so the field must vanish. Gauss's law then requires that no net charge exist within the metal either, so all of it resides on the surface.

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