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A magnetically soft material is characterised by

  • A.a high remanence and a high Curie temperature
  • B.a low saturation flux density and high resistivity
  • C.a narrow hysteresis loop and low coercivity
  • D.a broad hysteresis loop and high coercivity

Answer: C

Narrowness means little energy is dissipated per cycle, which is what a core taken repeatedly round the loop requires. Silicon steel and the nickel iron alloys are the standard soft materials, and permanent magnet alloys are their opposite in every respect.

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