Consider a cylindrical coaxial cable. The center conductor issolid with radius R, while the outer conductor is hollow with innerradius a and outer radius b, Both conductors have the same totalcurrent I (of uniform current density), but moving in the oppositedirection of each other. Find the magnitude of the magnetic fieldas a function of r (where r=0 at the central axis) in the intervala is less than or equal to r is less than b.
Note: your final equation should be in terms of the givenparameters (r, a, I, etc.) and any other known constants.
