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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) `20sqrt(5)`
(D) `20sqrt(10)`

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