Given below are two statements. One is labelled as Assertion (A) and the other is labelled as reason (R).

In the light of the given statements, choose the correct answer from the options given.

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

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

Both (A) and (R) are false

(A) is true but (R) is false

answer is C.

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Detailed Solution

In a paramagnetic material, the magnetic dipoles are randomly aligned. As the material is heated, the molecules gain energy and the alignment of dipoles gets further disrupted. Thus, the material shows weaker magnetization when heated. As the material is cooled down, the disruption in alignment of dipoles is reduced, hence, the dipoles get aligned and the material displays stronger magnetization.

Magnetisation is weak at higher temperatures and strong at lower temperatures and it does depend on temperature. Hence the reason is false.

The temperature dependency of the paramagnetic material's magnetisation which makes the magnetisation strong at lower temperatures would be a correct explanation for the given assertion.

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