Question

A current I = 1.00 A circulates in a round thin-wire loop of radius R = 100 mm. Find the magnetic induction 

(a) at the centre of the loop;

(b) at the point lying on the axis of the loop at a distance x = 100 mm from its centre.

Answer 1

(a) From the Biot - Savart law,

(b) From Biot-Savart’s law :

Here vector n is a unit vector perpendicular to the plane containing the current loop (Fig.) and in the direction of vector x

Thus we get,