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A shorted turn placed round part of a magnetic circuit carrying alternating flux will

  • A.increase the flux in that part of the circuit
  • B.carry a current only if the turn is of magnetic material
  • C.carry a heavy induced current and become hot
  • D.carry no current

Answer: C

The changing flux induces an emf in the turn and its low resistance lets a large current flow, which both heats it and opposes the flux. An accidental shorted turn in a transformer core clamp is a well-known cause of local overheating.

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