Question 2: Magnetic field in a coaxial cable [6pts] C The figure shows a cross-section of a very-long coaxial cable that runs in the z-direction. Suppose the inner wire (solid cylindrical wire with radius R1) carries current I into the page, and the outer wire carries current I out the page. Assume the current density is uniform in each wire. > 1. Using Amperes law, derive an equation for the magnetic field, B, in cylindrical coordinates (r, 45, z) for each of the following regions: i) 0 S r