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Question

Curie temperature is the temperature above which
  1. a ferromagnetic material becomes paramagnetic
  2. a paramagnetic material becomes diamagnetic
  3. a ferromagnetic material becomes diamagnetic
  4. a paramagnetic material becomes ferromagnetic

A
a ferromagnetic material becomes diamagnetic
B
a paramagnetic material becomes ferromagnetic
C
a ferromagnetic material becomes paramagnetic
D
a paramagnetic material becomes diamagnetic
Solution
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Curie Tempearture is the temperature at which certain materials lose their permanent magnetic properties, to be replaced by induced magnetism. In other words, it is the temperature above which a ferromagnetic material becomes paramagnetic.

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