Two parallel long wires carry current \( i_{1} \) and \( i_{2} \) w...

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Two parallel long wires carry current \( i_{1} \) and \( i_{2} \) with \( i_{1}>i_{2} \). When the currents are in the same direction, the magnetic field midway between the wires is \( 10 \mu \mathrm{T} \). When the direction of \( i_{2} \) is reversed, it becomes \( 40 \mu \mathrm{T} \). The ratio \( i_{1} / i_{2} \) is
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