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MHT CET 2026 (17 Apr, Shift 1) · Magnetic Field of Straight Wires

Magnetic Field of Straight Wires question from MHT CET 2026 (17 Apr, Shift 1)

Q3MHT CET 2026 · 17 APR · SHIFT 1Easy

Magnetic Field of Straight Wires

The magnetic field at perpendicular distance ' $r$ ' from a long wire carrying current ' $I$ ' is ' $B$ '. The magnetic field at perpendicular distance ' $2r$ ' from the same wire is

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Answer: (b)

$B = \dfrac{\mu_0 I}{2\pi r} \Rightarrow B \propto \dfrac{1}{r}$
At $2r$ : $B' = \dfrac{B}{2}$
So the answer is (b).

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