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The skin effect in a conductor at high frequency arises because

  • A.the magnetic permeability falls at high frequency
  • B.the induced eddy currents oppose the current in the interior
  • C.the resistivity of the metal rises with frequency
  • D.the displacement current crowds the conduction current outward

Answer: B

The changing flux within the conductor induces currents that add to the current at the surface and subtract from it at the centre, so the current crowds into a layer whose depth falls as the inverse square root of frequency. The effective resistance rises accordingly.

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