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The magnetic induction at a point on the...

The magnetic induction at a point on the axis of a circular current carrying coil at a distance equal to the radius of coil carrying a current of 0.5 A is

A

`piasqrt2xx10^-7T`

B

`(pia)/(sqrt2)xx10^-7T`

C

`pi/(2(sqrt2)axx10^-7T`

D

`(pisqrt2)/(a)xx10^-7T`

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