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Transformer cores are built of laminations in order to

  • A.reduce eddy current loss in the iron
  • B.reduce hysteresis loss in the iron
  • C.increase the reluctance of the magnetic circuit
  • D.reduce the copper required in the windings

Answer: A

Thin sheets separated by insulation break up the paths available to circulating currents, and the loss falls with the square of the thickness. Hysteresis loss depends on the grade of steel rather than on the lamination.

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