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Two concentric circular loops of radii r...

Two concentric circular loops of radii` r_(1)` and `r_(2)` carry clockwise and anticlockwise currents `i_(1)` and `i_(2)`. If the centre is a null point, `i_(1)//i_(2)` must be equal to

A

`r_(2)//r_(1)`

B

`r_(2)^(2)//r_(1)^(2)`

C

`r_(1)^(2)//r_(2)^(2)`

D

`r_(1)//r_(2)`

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