(28-32) Suppose the current in the coaxial cable of Problem 31, Fig. 28-42, is not uniformly distrib

(28-32) Suppose the current in the coaxial cable of Problem 31, Fig. 28-42, is not uniformly distributed, but instead the current density j varies linearly with distance from the center: j_1=C_1R for the inner conductor and j_2=C_2R for the outer conductor. Each conductor still carries the same total current I_0, in opposite directions. Determine the magnetic field in terms of I_0 in the same four regions of space as in Problem 31.