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A circular coil 'A' has a radius R and t...

A circular coil 'A' has a radius R and the current flowing through it is I. Another circular coil 'B' has a radius 2R and if 2I is the current flowing through it, then the magnetic fields at the centre of the circular coil are in the ratio of

A

`1:1`

B

`2:1`

C

`3:1`

D

`4:1`

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