A long, hollow, cylindrical conductor (inner radius 8.0 mm, outer radius 16.0 mm) carries a current of 16 A distributed uniformly across its cross section. A long thin wire that is coaxial with the cylinder carries a current of 16 A in the opposite direction. What is the magnitude of the magnetic field at the following distances from the central axis of the wire and cylinder? (a) 4.0 mm. _______T (b) 12.0 mm. _______ T (c) 20.0 mm. _______ T
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