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A perfectly conducting loop threaded by a changing external flux maintains

  • A.an emf equal to the rate of change of the external flux
  • B.a constant total flux linkage, the induced current making up the difference
  • C.a constant induced current whatever the external flux
  • D.zero flux linkage at all times

Answer: B

With no resistance any emf would drive an unbounded current, so the total flux linkage cannot change; the induced current adjusts to hold it constant. This flux conservation is the basis of superconducting magnets and of the persistent currents observed in them.

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