Two parallel long wires carry currents i₁ and i₂ with i₁ > i₂ . When the currents are in the same direction, then the magnetic field midway between the wires is 10μT. When the direction of i₂ is reversed, then it becomes 40μT. Then, ratio of i₁/ i₂ is

Options

(a) (3:4)
(b) (5:3)
(c) (7:11)
(d) (11:7)

Correct Answer:

(5:3)

Explanation:

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