[Question 4] Figure shows a coaxial cable, widely used in
electronics to minimize interference either with or from
signals carried on the cable. The cable consists of an inner
solid conductor of radius a and a hollow outer conductor of
inner radius b and thickness c. The two conductors carry
equal but opposite currents I, distributed uniformly over their
cross-sectional areas. Find expressions for the magnetic field
2b
strength as a function of radial position r (a) within the inner conductor, (b) between the inner
and outer conductors, (c) within the outer conductor, and (d) beyond the outer conductor. (1
point)