A long cylindrical conductor whose axis is coincident with the z-axis has a radius a and c...

A long cylindrical conductor whose axis is coincident with the z-axis has a radius a and carries a current characterized by a current density J = J0/r, where J0 is a constant and r is the radial distance from the cylinder’s axis. Obtain an expression for the magnetic field H for

(a) 0 ≤ r ≤ a

(b) r > a