Two long parallel wires carry \( \mathrm{i} \) and \( 2 i \) curren...
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Two long parallel wires carry \( \mathrm{i} \) and \( 2 i \) current in same direction. Magnetic field just between the wires is \( \mathrm{B} \) . If \( 2 i \) current is switched off then magnetic field at the same point is
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