A current carrying wire (current = i) pe...

A current carrying wire (current = i) perpendicular to the plane of the paper produced a magnetic field, as shown in the figure. A square of side a is drawn with one of its vertices on the wire. The integral `ointvecB.dvecr` along PQR has the value

`+mu_(0)i`

`(mu_(0)i)/(8)`

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

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

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