CBSE 2023 · Region 3 · Set 1 · Q17 · 1 mark
Assertion (A) : When radius of a circular loop carrying a steady current is doubled, its magnetic moment becomes four times. Reason ( $\displaystyle R$ ): The magnetic moment of a circular loop carrying a steady current is proportional to the area of the loop.
Official answer
From CBSE’s own marking scheme for this paper.
(A)
Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Moving Charges and MagnetismTorque on Current Loop, Magnetic DipoleUnderstandassertion_reasoneasy
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CBSE Class 12 Physics past-paper question from the 2023board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.