A part of a long wire carrying a current...

A part of a long wire carrying a current `i` is bent into a circle of radius `r` as shown in figure. The net magnetic field at the centre `O` of the circular loop is

`(mu_(0)i)/(4r)`

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

`(mu_(0)i)/(2pir)(pi+1)`

`(mu_(0)i)/(2pir)(pi-1)`

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