Two long parallel wires carry currents `i_1 and i_2` such that `i_1 gt i_2`. When the currents are in the same direction, the magnetic field at a point midway between the wires is `6 times 10^-6 T`. IF the direction of `i_2` is reversed, the field becomes `3 times 10^-6 T`. The ratio `i_1/i_2` is

Options

A. 1
B. 2
C. 3
D. 4

Answer

B