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A coaxial cable carries the a current i ...

A coaxial cable carries the a current i in the inside conductor of radius a as shown in figure-4.80 and the outer conductor of inner radius b and outer radius c carries a current i' in opposite direction. Find the magnetic induction due to the coaxial cable at distance r from the central axis of the cable for (a) `r gt a`, (b) `a lt r lt b` and (c) `b gt r gt c`

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