A current I flows in a thin wire in the ...

A current I flows in a thin wire in the shape of a regular polygon n sides. The magnetic induction at the centre of the polygon when `ntooo` is (R is the radius of its circumcircle)

`(mu_(0)ni)/(2piR)"tan"(pi)/6`

`(mu_(0)n i)/(2piR) "tan"(pi)/R`

`(mu_(0)i)/(2R)`

zero

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