Question

Assertion $(A)$ Above Curie temperature, a ferromagnetic material becomes paramagnetic.
Reason $(R)$ When a magnetic material is heated to very high temperature, it loses its magnetic properties.

• A. If both Assertion and Reason are true and Reason is correct explanation of Assertion.
• B. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion.
• C. If Assertion is true but Reason is false.
• D. If both Assertion and Reason are false.

Answer 1

Answer: (A)

Above Curie temperature $T_{C}$, the magnetic susceptibility of a ferromagnetic material varies as
$\chi_{m} \propto \frac{1}{T-T_{C}}$
when temperature is increased beyond $T_{C}$, ferromagnetic material becomes paramagnetic.