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Above its Curie temperature a ferromagnetic material becomes

  • A.diamagnetic
  • B.antiferromagnetic
  • C.permanently magnetised
  • D.paramagnetic

Answer: D

Thermal agitation destroys the domain alignment and only the weak paramagnetic response of the individual moments remains. Iron's Curie point is about 770 degrees Celsius, which is why a transformer core must never be allowed to approach that temperature.

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