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Eddy current loss in a transformer core is reduced by

  • A.raising the operating frequency of the transformer
  • B.laminating the core and insulating the laminations
  • C.increasing the cross-sectional area of the core
  • D.using a material of lower resistivity

Answer: B

Thin laminations restrict the area of each eddy current loop and so the voltage driving it, and the loss falls as the square of the lamination thickness. A material of higher resistivity, such as silicon steel or a ferrite, helps for the same reason.

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