CBSE 2026 · Region 1 · Set 3 · Q10 · 1 mark
A circular loop has radius R and carries current I as shown in figure. In order that the net magnetic field at the centre of the loop is zero, the current in wire AB should have magnitude
Official answer
From CBSE’s own marking scheme for this paper.
(A)
$\displaystyle 2 \pi \mathrm{I}$, along +X - axis
Moving Charges and MagnetismMagnetic Field due to a Current Element, Biot-Savart LawApplymcqmedium
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.