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The magnetic field at the centre of a ci...

The magnetic field at the centre of a circular current carrying conductor of radius `r` is `B_c`. The magnetic field on its axis at a distance `r` from the centre is `B_a`, The value of `B_c : B_c` will be

A

`sqrt2 : 1`

B

`2sqrt2 : 1`

C

`1 : 2sqrt2`

D

`1 : sqrt2`.

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