A wire in the from of a square of side '...

A wire in the from of a square of side `'a'` carries a current `i`. Then the magnetic induction at the centre of the square wire is (Magnetic permeability of free space=`mu_(0)`)

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

`(mu_(0)isqrt2)/(pia)`

`(2sqrt2mu_(0)i)/(pia)`

`(mu_(0)i)/(sqrt2 pia)`

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