Curie temperature above which (a) paramagnetic material becomes ferromagnetic material (b) ferromagnetic material becomes diamagnetic material (c) ferromagnetic material becomes paramagnetic material (d) paramagnetic material becomes diamagnetic material

Answer: (c). Above the Curie temperature TC, thermal motion destroys the domain alignment of a ferromagnet. The material then behaves like a paramagnet with χ = (C)/(T - TC). So the answer is (c): a ferromagnetic material becomes paramagnetic.

Curie temperature above which | NEET 2006 (AIPMT)

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Magnetic Materials & Curie Law

Curie temperature above which

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Answer: (c)

Above the Curie temperature $T_C$ , thermal motion destroys the domain alignment of a ferromagnet.
The material then behaves like a paramagnet with $\chi = \dfrac{C}{T - T_C}$ .
So the answer is (c): a ferromagnetic material becomes paramagnetic.

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