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Two coplanar circular coils of equal rad...

Two coplanar circular coils of equal radius carrying currents `i_(1),i_(2)` in opposite directions are at a large distance `'d'`. The distance from the first coil where the resultant magnetic induction is zero is

A

`d/1+i_(2)/i_(1)`

B

`d/1+sqrt(i_(2)/i_(1))`

C

`d/1+(i_(2)/i_(1))^(1/3)`

D

`d/1+(i_(2)/i_(1))^(2)`

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