A solid conductor with radius a is supported by insulating disks on the axis of a conducting tube with inner radius b and outer radius c. The central conductor and tube carry equal currents I in opposite directions. The currents are uniformly distributed over the cross sections of each conductor. This is known as a coaxial cable. Calculate and sketch the magnetic field as a function of distance from the central axis of this coaxial cable.
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This solution shows step-by-step calculations to determine the magnetic field of the coaxial cable using Gauss's law of magnetostatics. All formulas are shown with justifications.