Find the magnetic field of a coaxial cable inside a cylindrical shell?

a coaxil cable has a center conductor of radius RA (=.005 m) and a coaxial cylindrical shell od inter radius RB(.015 m) and outer radius of RC(=.02 m). the central conductor carries a current i1(=10 amps) and the outer conductor carries a uniformly distributed current i2(=20 amps) but opposite in directionof i1. Derive expressions (not numerical values) for the magnetic fiel produced at radial points (i) rRC plot the B-field as a function of r. on your graph label points A, B, and C with the appropriate proportion and label values(numerical) on the y-axis for the various interfaces