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

`pi a sqrt(2) xx 10^(-2)` T

`(pi a)/sqrt(2) xx 10^(-7)` T

`pi/(sqrt(2)a) xx 10^(-7)` T

`(pi sqrt(2))/a xx 10^(-7)` T

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