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From Ampere’s circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field in the inside and outside region of the wire is:

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a linearly increasing function of distance up to the boundary of the wire and then linearly decreasing for the outside region.

a linearly decreasing function of distance up to the boundary of the wire and then a linearly increasing one for the outside re

a linearly increasing function of distance r up to the boundary of the wire and then decreasing one with 1/r dependence for the outside region.

uniform and remains constant for both the regions.

answer is B.

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Detailed Solution

$B \propto r (r \leq R) B \propto \frac{1}{r} (r \geq R)$

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