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MHT CET 2026 (17 Apr, Shift 2) · Magnetic Field of Straight Wires

Magnetic Field of Straight Wires question from MHT CET 2026 (17 Apr, Shift 2)

Q2MHT CET 2026 · 17 APR · SHIFT 2Easy

Magnetic Field of Straight Wires

The magnetic field at a distance 'r' from a long straight wire carrying current I is 0.4 tesla. The magnetic field at a distance 2r will be

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Answer: (b)

$B \propto \dfrac{1}{r}$ for a long straight wire.
Doubling the distance halves the field: $B' = \dfrac{0.4}{2} = 0.2$ T
So the answer is (b) 0.2 tesla.

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