Consider two thin identical conducting wires covered with very thin insulating material. One of the wires is bent into a loop and produces magnetic field B1 , at its centre when a current I passes through it. The ratio B1 : B2 is:
(a) 1 : 1
(b) 1 : 3
(c) 1 : 9
(d) 9 : 1
Correct option: (b) 1 : 3
Explanation:
where, a is the radius of loop.
at the centre x = radius of loop
