Figure shows a cross section of along conducting coaxial cable and gives its radii (a,b,c). Equal but opposite currents i are uniformly distributed in the two conductors. Derive expressions for B(r) with radial distance r in the ranges (a) ra. (e) Test these expressions for all the special cases that occur to you. (f) Assume that a=2.0cm,b=1.8cm,c=0.40cm, and i=120A and plot the function B(r) over the range 0