Question: 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

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 = zJ0/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 and
(b) r > a.

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