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Halving the thickness of the laminations of a core reduces its eddy current loss to

  • A.the same value, thickness not affecting the loss
  • B.a quarter of its former value
  • C.half of its former value
  • D.an eighth of its former value

Answer: B

Eddy current loss varies as the square of the lamination thickness, so halving it quarters the loss. The limit is set by manufacture and by the space the extra insulation occupies, which reduces the effective iron area of the core.

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