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Magnetic fields at two points on the axi...

Magnetic fields at two points on the axis of a circular coil at a distance of `0.05m` and `0.2 m` from the centre are in the ratio `8:1`. The radius of the coil is

A

`0.2 m`

B

`0.1 m`

C

0.15

D

1.0 M

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The correct Answer is:
B
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