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Q.

The Curie-Weiss law is obeyed by iron

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a

at all temperatures

b

at the Curie temperature only

c

below the Curie temperature

d

above the Curie temperature

answer is B.

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Detailed Solution

We know from the Curie-Weiss law that susceptibility of a ferromagnetic substance relates with temperature above its Curie temperature. 

χ=CT-Tc

Since, iron is a ferromagnetic substance, therefore Curie-Weiss law is obeyed by it at a temperature above the Curie temperature.

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