Solve this one

Solve this one A Jong straight metal rod has a very long hole of radius a' drilled parallel to the rod's axis at a distance c the axis of the rod as shown in the figure, It the carries a current l, find the magnetic field (a) on the axis of the rod, (b) on tt-w axis ot hole.

Dear student,
consider another rod without cavity and with same uniform current as in original situation, and a rod of radius 'a' with same uniform current density but current in opposite direction. These two rods when arranged like original figure would produce equivalent rod with cavity.


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