Answer Happy

Consider a coaxial cable as shown in the figure. The cable consists of a solid inner conductor of radius ri = 0.4 cm that is surrounded by a cylindrical tube of inner radius r2 = 0.9 cm and outer radius r3 = 1.8 cm. The conductors carry equal and opposite currents I = 2 A but the current density varies linearly with the distance from the center for the inner conductor (ji = cir) while it is distributed uniformly for the outer conductor. Determine the magnetic field (in units of uT (microtesla)) at a distance r = 1.2 cm from the axis. = (uo = 41 x 10-7 N/A2 and 1 = 3.14) Answer: 2 13