Two parallel, long wires carry currents \( \mathrm{i}_{1} \) and \(...

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Two parallel, long wires carry currents \( \mathrm{i}_{1} \) and \( \mathrm{i}_{2} \) with \( \mathrm{i}_{1}\mathrm{i}_{2} \). When the current are in the same direction, the magnetic field at a point midway between the wire is \( 20 \mu \mathrm{T} \). If the direction of \( i_{1} \) is reversed, the field becomes \( 30 \mu \mathrm{T} \). The ratio \( \mathrm{i}_{1} / \mathrm{i}_{2} \) is
(A) 4
(B) 3
(C) 5
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