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A coaxial cable consists of a long cylindrical copper wire of radius ri surrounded by a cylindrical shell of inner radius r2 and outer

A coaxial cable consists of a long cylindrical copper wire of radius ri surrounded by a cylindrical shell of inner radius r2 and outer radius r3 (see Figure). The wire and the shell carry equal and opposite currents I uniformly distributed over their volumes. Find formulas for the magnetic field in each of the regions r < ri, ri< r < r2, r2 < r < r, and r > r3. 12 solid 13 rl 

A coaxial cable consists of a long cylindrical copper wire of radius ri surrounded by a cylindrical shell of inner radius r2 and outer radius r3 (see Figure). The wire and the shell carry equaland opposite currents I uniformly distributed over their volumes. Find formulas for the magnetic field in each of the regions r

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