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A coaxial cable has current on the inner conductor 8A in +x direction and returns in...

A coaxial cable has current on the inner conductor 8A in +x direction and returns in –x direction at the outer conductor. The inner conductor radius is 2 m and outer conductor radii are 4 and 6.
Apply ampere’s law and calculate the magnitude of magnetic field inside the inner conductor.

Answer Options are: r/pi ; 8/pi*r ; (8*r)/2*pi

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