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True or false: the potential inside a hollow charged conductor is zero.

  • A.True, if the cavity contains no charge
  • B.False, the interior sitting at the same potential as the shell itself
  • C.True, matching the vanishing field within it
  • D.True, provided the conductor is earthed

Answer: B

Correct answer: False, the interior sitting at the same potential as the shell itself

Zero field within means constant potential within, and continuity at the surface fixes that constant at the shell’s own value. The interior would be at zero only if the shell were earthed, which is a different arrangement.

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