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Grain-oriented steel is used in transformer cores because its permeability is high

  • A.in every direction equally
  • B.at right angles to the rolling direction
  • C.only above a certain flux density
  • D.along the rolling direction

Answer: D

Cold rolling and annealing align the crystal axes so that the easy direction of magnetisation lies along the strip. A transformer core can be built so the flux follows that direction everywhere, which a rotating machine cannot, and that is why the material suits one and not the other.

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