A charge of `1C` is placed at one end of a non conducting rod of length `0.6m`. The rod is rotated in a vertical plane about a horizontal axis passing through the other end of the rod with angular frequency `10^(4)pi rad//s.` Find the magnetic field at a point on the axis of rotation at a distance of `0.8m ` from the centre of the path.

Explanation

`B = (mu_0 ir^2)/(2(r^2 + x^2)^(3//2) ), i=(qomega)/(2pi) , B = (mu_0)/(4pi) (q omega r^2)/((r^2 + x^2)^(3//2) )`