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  4. A current i ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is

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Q. A current $ i $ ampere flows along the inner conductor of a coaxial cable and returns along the outer conductor of the cable, then the magnetic induction at any point outside the conductor at a distance r metre from the axis is

Jharkhand CECEJharkhand CECE 2012

Solution:

The described condition can be shown as .The magnetic field at P due to inner and outer conductors are equal and opposite. Hence, the net magnetic field at P will be zero.

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