A circular coil of radius R carries a cu...

A circular coil of radius `R` carries a current `i`. The magnetic field at its centre is `B`. The distance from the centre on the axis of the coil where the magnetic field will be `B//8` is

A

3r

B

2r

C

`sqrt(3)` r

D

`sqrt(2)` r

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The correct Answer is:

C

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