Two parallel long wires A and B carry currents i1 and i2(< i1). When i1 and i2 are in the same direction, the magnetic field

Two parallel long wires A and B carry currents i₁ and i₂(< i₁). When i₁ and i₂ are in the same direction, the magnetic field at a point mid way between the wires is 10μT. If i₂ is reverse, the field becomes 30 μT. The ratio i₁/i₂ is

(a) 1

(b) 2

(d) 4

Two parallel long wires A and B carry currents i1 and i2(< i1). When i1 and i2 are in the same direction, the magnetic field

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