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Two long parallel wires carry currents i1 and i2 (i1 > i2) when the currents are in opposite direction, the magnetic field at a point midway between the wires is 30 mT. If the direction of i2 is changed, the field becomes 10 mT . The ratio i1/i2 is

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Two long parallel wires carry currents i<sub>1</sub> and i<sub>2</sub> (i<sub>1</sub> > i<sub>2</sub>) when the currents are in opposite direction, the magnetic field at a point midway between the wires is 30 mT. If the direction of i<sub>2</sub> is changed, the field becomes 10 mT . The ratio i<sub>1</sub>/i<sub>2</sub> is






 
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