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The ratio of magnetic induction at a poi...

The ratio of magnetic induction at a point along the axis of a circular coil of radius 'a' at a distance `x` to a point where x tends to zero is [x>>a]

A

`x^3/a^3`

B

`a^3/x^3`

C

`(2a^3)/x^3`

D

`(2x^3)/a^2`

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