18.1 A long straight wire of radius a is oriented with its center along the z axis. Within the wire is the current density s² J(s) = Jo 2. (a) Find the magnetic field B both inside and outside the wire. (b) Is the magnetic field continuous at the boundary s = a? Why is this? Answer: (a) + 4 B(s) = HOJ - 83 a2P 0 < s a
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