An infinitely long straight wire carrying current I is bent in a… | JEE Main 2026 Physics PYQ

MCQMediumJEE Main 2026 · 21 January, Shift 2Biot–Savart Law

An infinitely long straight wire carrying current $I$ is bent in a planar shape as shown in the diagram. The radius of the circular part is $r$ . The magnetic field at the centre $O$ of the circular loop is :

A straight horizontal wire segment with points A, B, D, and E marked, bent into a circular loop above the wire touching near B and D, center O shown with radius r to the loop, current I indicated along the wire and loop, and axes labeled x, y, z near the right side.

A
$\frac{\mu_0 I}{2 \pi r} (\pi - 1) \hat{i}$
B
$\frac{\mu_0 I}{2 \pi r} (\pi + 1) \hat{i}$
C
$-\frac{\mu_0 I}{2 \pi r} (\pi - 1) \hat{i}$
D
$-\frac{\mu_0 I}{2 \pi r} (\pi + 1) \hat{i}$

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