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The field inside a hollow current-carrying cylindrical conductor, on its axis, is

  • A.uniform and directed along the axis
  • B.zero
  • C.the same as at the outer surface of the conductor
  • D.the same as that of a straight wire at the same radius

Answer: B

An Amperian circle drawn inside the hollow encloses no current, so the line integral of H is zero and the symmetry forces the field to vanish. This is the magnetic counterpart of the field-free interior of a charged conducting shell.

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