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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The property of diamagnetism is said to be present in all materials. Then, why are some materials paramagnetic or ferromagnetic?
The permanent magnetic moment of the atoms of a material is zero. The material
(a) must be paramagnetic
(b) must be diamagnetic
(c) must be ferromagnetic
(d) may be paramagnetic
The magnetic susceptibility is negative for
(a) paramagnetic materials only
(b) diamagnetic materials only
(c) ferromagnetic materials only
(d) paramagnetic and ferromagnetic materials
Assertion :At high temperature, a ferromagnet becomes a paramagnet. Reason: The ferromagnetic property depends on temperature.
Assertion :Above Curie temperature, a ferromagnetic material becomes paramagnetic. Reason: When a magnetic material is heated to very high temperature, it loses its magnetic properties.