Question

B_X and B_Y are the magnetic field at the centre of two coils of two coils X and Y respectively, each carrying equal current. If coil X has 200 turns and 20 cm radius and coil Y has 400 turns and 20 cm radius, the ratio of B_X and B_Y is

(A) 1 : 1

(B) 1 : 2

(C) 2 : 1

(D) 4 : 1

Answer 1

Correct option is (B) 1 : 2