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Two parallel wires carrying equal curren...

Two parallel wires carrying equal currents `i_(1)` and `i_(2)` with `i_(1)gti_(2)`. When the current are in the same direction, the `10 mT`. If the direction of `i_(2)` is reversed, the field becomes `30 mT`. The ratio `i_(1)//i_(2)` is

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The correct Answer is:
2
`10 mT=(mu_(0))/(2 pi (r//2)) (i_(1)-i_(2))`
`30 mT=(mu_(0))/(2 pi(r//2)) (i_(1)+i_(2))`
Dividing : (i_(1))//(i_2)=2`.
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