| Assertion (A): Ferromagnetic substances become paramagnetic beyond Curie temperature. |
| Reason (R): Domains are destroyed at high temperature. |
A) Both A and R are true and R is the correct explanation of A
B) Both A and R are true but R is NOT the correct explanation of A
C) A is true but R is false
D) A is false and R is true
Correct Answer: A
Solution :
| Option [a] is correct. |
| Explanation: From Curie Weiss law, |
| \[\chi =\frac{C}{T-{{T}_{C}}}\] |
| As temperature increases beyond Curie temperature, susceptibility decreases and the ferromagnetic substances become paramagnetic. So, the assertion is true. |
| Paramagnetic substance has no magnetic domain. At a very high temperature, the domains of ferromagnetic substance get destroyed and the substance transforms into paramagnetic substance. So, the reason is also true and properly explains the assertion. |
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