From ampere's circuital law for a long strate wire of circular cross-section carrying study current, the variation of magnetic field in the inside and outside reason of the wire is :

(1) a linearly decreasing function of distance upto the boundary of the wire and then a linearly increasing one for the outside region.

(2) uniform and remains constant for both the regions.

(3) a linearly increasing function of distance upto the boundary of the wire and then linearly decreasing for the outside region.

(4) 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.

(1) a linearly decreasing function of distance upto the boundary of the wire and then a linearly increasing one for the outside region.

(2) uniform and remains constant for both the regions.

(3) a linearly increasing function of distance upto the boundary of the wire and then linearly decreasing for the outside region.

(4) 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.