A coaxial cable has an inside conductor of negligible radius carrying a current I. The current I returns as a uniform current through the outside conductor with an inside radius a and outside radius b. (A uniform current means that the current density is constant.) What is the magnetic field a distance r from the center? (include r

A coaxial cable has an inside conductor of negligible radius carrying a current I. The current I returns as a uniform current through the outside conductor with an inside radius a and outside radius b. (A uniform current means that the current density is constant.) What is the magnetic field a distance r from the center? (include r

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