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

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

Tardigrade Admin · Accepted Answer

Correct answer is (d) 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.

Q. 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 :

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

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 $1/ r$ dependence for the outside region.

Correct answer is (d) 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.