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

1. A. A linearly increasing function of distance upto the boundary of the wire and then linearly decreasing for the outside region.
2. B. A linearly increasing function of distance r upto the boundary of the wire and then decreasing one with 1 r dependence for the outside region.
3. C. A linearly decreasing function of distance upto the boundary of the wire and then a linearly increasing one for and outside region.
4. D. Uniform and remains constant for both the regions.

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