A long straight metal rod has a very lon...

A long straight metal rod has a very long hole of radius `'a'` drilled parallel to the rod axis as shown in the figure. If the rod carries a current `I`, find the magnetic field on axis of hole. Given `C` is the centre of the hole and `OC=c`.

`(mu_(0)ic)/(pi(b^(2)-a^(2)))`

`(mu_(0)ic)/(2pi(b^(2)-a^(2)))`

`(mu_(0)i(b^(2)-a^(2)))/(2pic)`

`(mu_(0)ic)/(2piab)`

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