A long conducting cylindrical shell is concentric about a long wire. The shell has outer radius c and inner radius b, while the wire has radius a: a < b < c. The wire has a uniform current 3i into the page and the shell has a uniform current Si out of the page. A cross-section of the arrangement is shown to the right. Use Ampere's Law to answer the following questions. (a) What is the magnetic field, B(r), for r O