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Comparing the field of a charged conducting sphere with that of a solid insulating sphere of the same total charge and radius, the two are

  • A.identical outside and different inside
  • B.identical both inside and outside the sphere
  • C.different outside and identical inside
  • D.identical only at the surface of the sphere

Answer: A

Outside, only the total enclosed charge matters, so the fields agree. Inside, the conductor is field free while the insulator has a field rising linearly from the centre, because charge is distributed through its volume.

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