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a long coaxial cable consits of two thin...

a long coaxial cable consits of two thin-walled conducting cyclider carries a steady current `0.1 A`, and the outer cylinder provides the return path for that current. The current produced a magnetic field between the two cylinders. Find the energy stored in the magnetic field for length `5m` of the cable. Express answer in Nj (use `1n2 = 0.7`).

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