Use Ampere's Law to find the magnetic field inside and outside a straight wire of radius Rcarrying current I uniformly distributed over it's circular cross-sectional area A. Create a general equation to express the magnetic field magnitude for all distances r from the wire's center. Put your answer in terms of r, R, I, and constants, and (optional) then again in terms of r, R, j, and constants, where j = I/A is the current density of the wire. Draw the Amperian loop and current distribution.