CBSE 2025 · Region 7 · Set 2 · Q3 · 1 mark
In a circular loop of radius $\displaystyle \mathrm{R}$, current $\displaystyle \mathrm{I}$ enters at point $\displaystyle A$ and exits at point B, as shown in the figure. The value of the magnetic field at the centre O of the loop is:
Official answer
From CBSE’s own marking scheme for this paper.
(B)
zero
Moving Charges and MagnetismMagnetic Field on the Axis of a Circular Current LoopApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2025board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.