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Silicon is added to transformer steel chiefly to

  • A.lower its Curie temperature for easier annealing
  • B.increase its remanence so that less current is needed
  • C.raise its resistivity and reduce eddy current loss
  • D.raise its saturation flux density

Answer: C

A few per cent of silicon raises the resistivity several fold and also reduces the hysteresis loss, at the cost of making the material brittle and lowering the saturation flux density slightly. The trade has been settled at about three or four per cent for a century.

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