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A circular coil of radius 2R is carrying...

A circular coil of radius 2R is carrying current 'i' . The ratio of magnetic fields at the centre of the coil and at a point at a distance 6R from the centre of the coil on the axis of the coil is

A

10

B

`10 sqrt(10)`

C

`20 sqrt(5)`

D

`20 sqrt(10)`

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The correct Answer is:
B
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