If in circular coil of radius R, current...

If in circular coil of radius `R`, current `I` is flowing and in another coil `B` of radius `2R` a current `2I` is flowing , then the raatio of the magnetic fields `B_(A) and B_(B)`, produced by them will be

`4 : 1`

`2 : 1`

`6 : 1`

`1 : 1`

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