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Question

Curie temperature is the temperature above which
a ferromagnetic material becomes diamagnetic
a ferromagnetic material becomes paramagnetic
a paramagnetic material becomes ferromagnetic.
a paramagnetic material becomes diamagnetic

A

a ferromagnetic material becomes paramagnetic

B

a ferromagnetic material becomes diamagnetic

C

a paramagnetic material becomes ferromagnetic.

D

a paramagnetic material becomes diamagnetic

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Solution

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Curie temperature is the temperature at which certain materials lose their permanent magnetic properties, to be replaced by induced magnetism.
Permanent magnetism is caused by the alignment of magnetic moments and induced magnetism is created when disordered magnetic moments are forced to align in an applied magnetic field. Higher temperatures make magnets weaker, as spontaneous magnetism only occurs below the Curie temperature.

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