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A long coaxial cable consists of two con...

A long coaxial cable consists of two concentric cylinders of radii a and b. The central conductor of the cable carries a steady current I and the outer conductor provides the return path of the current. Calculate the energy stored in the magnetic field of length l of such a cable

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The correct Answer is:
`(mu_(0)i^(2)l)/(4pi)In((b)/(a))`
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