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The magnetostriction of a magnetic material is

  • A.the increase of its resistivity in a magnetic field
  • B.a small change of its dimensions on being magnetised
  • C.the reduction of its permeability at high flux density
  • D.the loss of magnetisation when it is heated

Answer: B

The strain is only a few parts per million but it reverses twice per cycle, and it is the source of the hum of a transformer. Reducing it is one of the objects of core material development and of the clamping arrangements used in a quiet transformer.

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