AIIMS 2007
- Exam
- AIIMS
- Year
- 2007
- Subject
- Physics
- Chapter
- Magnetic Properties of Matter
AIIMS 2007 · Physics · Magnetic Properties of Matter
Assertion : Ferro magnetic substances become paramagnetic above...
Assertion : Ferro magnetic substances become paramagnetic above Curie temperature.
Reason : Domains are destroyed at high temperature.
Options
- AIf both assertion and reason are true and reason is the correct explanation of assertion
- BIf both assertion and reason are true but reason is not the correct explanation of assertion
- CIf assertion is true but reason is false
- DIf both assertion and reason are false.
Correct answer
A. If both assertion and reason are true and reason is the correct explanation of assertion
Step-by-step solution
The assertion is true. From Curie Weiss law where the susceptibility (\chi=\frac{C}{\left(T-\theta_C\right)}). If the temperature rises above the Curie temperature (\theta_C), ferromagnetic materials become paramagnetic materials because the domains get destroyed as stated.