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

Question

Uniform and remains constant for both the regions.

A linearly increasing function of distance upto the boundary of the wire and then linearly decreasing for the outside region.

A linearly increasing function of distance r upto the boundary of the wire and then decreasing one with ${1 \over r}$ dependence for the outside region.

A linearly decreasing function of distance upto the boundary of the wire and then a linearly increasing one of the outside region.

Solution

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