NEET Physics Ampere's Law MCQ Question with Solution

For a long straight wire carrying a current I, what is the magnetic field B at a distance r from the wire, where r > a?

A

μ0 I / (2πr)

B

μ0 I / (4πr)

C

μ0 I r / (2πa^2)

D

μ0 I a / (2πr^2)

Option A

For a long straight wire, Ampere's law gives B (2πr) = μ0 I, leading to B = μ0 I / (2πr) for r > a, according to the NCERT context.

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