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:

Options

A. uniform and remains constant for both the regions
B. a linearly increasing function of distance upto the boundary of the wire and then linearly decreasing for the outside region
C. 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
D. a linearly decreasing function of distance upto the boundary of the wire and then a linearly increasing one for the outside region