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JEE Main 2026 (21 Jan, Shift 2) · Magnetic Field of Straight Wires

Magnetic Field of Straight Wires question from JEE Main 2026 (21 Jan, Shift 2)

Q13JEE Main 2026 · 21 JAN · SHIFT 2Medium

Magnetic Field of Straight Wires

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:

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Answer: (b)

Circular loop (current clockwise as seen from $+x$ ): $\frac{\mu_0 I}{2r}$ along $-\hat{i}$ .
Infinite straight wire ABDE at distance $r$ below O, current along $+\hat{j}$ : $\frac{\mu_0 I}{2\pi r}$ along $+\hat{i}$ .
$\vec{B} = -\frac{\mu_0 I}{2\pi r}(\pi - 1)\hat{i}$
So the answer is (b).

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