Question

A circular loop of radius r is carrying current I A. The ratio of magnetic field at the centre of circular loop and at a distance r from the center of the loop on its axis is :

(1) 1 : 3√2

(2) 3√2 : 2

(3) 2√2 : 1

(4) 1 : √2

Answer 1

Correct option (3) 2√2 : 1

Magnetic field due to current carrying circular loop on its axis is given as