NEET Physics Question - Magnetic Effects of Current

Assertion (A): The properties of paramagnetic and ferromagnetic substances are not affected by heating.

Reason (R): As temperature changes, the alignment of molecular magnets does not change.

(1) Both (A) & (R) are true and the (R) is the correct explanation of the (A)

(2) Both (A) & (R) are true but the (R) is not the correct explanation of the (A)

(3) (A) is true but (R) is false

(4) Both (A) and (R) are false

Solution:

The magnetic properties of paramagnetic and ferromagnetic substances are strongly affected by temperature. Paramagnetic susceptibility is temperature-dependent (Curie's Law), and ferromagnets become paramagnets above their Curie temperature. Thermal agitation due to heating disorients molecular magnets. Both Assertion (A) and Reason (R) are false.

Rankers Physics

Magnetic Properties and Heating

Solution:

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