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The potential of a uniformly charged spherical shell at points inside it is

  • A.the same as that of a point charge at the centre
  • B.constant and equal to its surface value
  • C.zero, matching the vanishing field inside
  • D.rising linearly from the centre to the surface

Answer: B

Correct answer: constant and equal to its surface value

The field inside the shell is zero, so no work is done moving a charge anywhere within it and the potential cannot change - it holds the value it has at the surface. Zero field means constant potential, not zero potential, which is the distinction this item exists to make.

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