Assertion: The ferromagnetic substance does n | vedclass

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(A) The magnetic susceptibility of a ferromagnetic substance does not follow Curie's law $( \chi \propto 1/T )$ below the Curie temperature $( T_C )$.

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If both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

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(A) The magnetic susceptibility of a ferromagnetic substance does not follow Curie's law $( \chi \propto 1/T )$ below the Curie temperature $( T_C )$. Instead, it follows the Curie-Weiss law: $ \chi = \frac{C}{T - T_C} $ for $ T > T_C $. At the Curie point $( T_C )$, the ferromagnetic substance undergoes a phase transition and begins to behave as a paramagnetic substance. Since the assertion states that ferromagnetic substances do not obey Curie's law (which is true for the ferromagnetic state itself), and the reason correctly explains the transition at the Curie point, both are correct and the reason explains the assertion.

Assertion: The ferromagnetic substance does not obey Curie's law.
Reason: At Curie point, a ferromagnetic substance starts behaving as a paramagnetic substance.

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Assertion: The ferromagnetic substance does not obey Curie's law.Reason: At Curie point, a ferromagnetic substance starts behaving as a paramagnetic substance.