A long, hollow cylinder with inner radius R1 and outer radius R2 carries current along its length. The current is uniformly distributed over the cross-sectional area of the cylinder and has current density J. 1. Find the magnetic-field magnitude B as a function of the distance r from the conductor axis for points inside the hollow interior (r 2. Find the magnetic-field magnitude B as a function of the distance r from the conductor axis for points inside the solid conductor (R1 3. Find the magnetic-field magnitude B as a function of the distance r from the conductor axis for points outside the conductor (r>R2).