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Consider a coaxial cable as shown in the figure. The cable consists of a solid inner conductor of radius rı = 0.3 cm that is surrounded by a cylindrical tube of inner radius r2 = 0.7 cm and outer radius r3 = 2 cm. The conductors carry equal and opposite currents I = 4 A but the current density varies linearly with the distance from the center for the inner conductor j1 = Cir) while it is distributed uniformly for the outer conductor. Determine the magnetic field (in units of uT (microtesla)) at a distance r = 1.3 cm from the axis. (Mo = 41 x 10-7N/A² and 1 = 3.14) (μο = = T = Answer: 1 13