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A circular coil A is of radius R and cur...

A circular coil A is of radius R and current I, another circular coil 'B’ is of radius 2R and current 2I.The ratio of magnetic field `B_A : B_B` at their centre is—

A

`4:1`

B

`1:1`

C

`2:1`

D

`3:1`

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