Two parallel wires carrying equal currents in opposite direction are placed at x = ± a parallel to y-axis with z = 0…..

Q. Two parallel wires carrying equal currents in opposite direction are placed at x = ±  a parallel to y-axis with z = 0. Magnetic field at origin O is B₁ and at P (2a, 0, 0) is B₂. Then, the ratio B₁/B₂ is

(a) 3

(b) 1/2

(c) 1/3

(d) 2

Ans: (a)