A very long wire ABDMNDC is shown in fig...

A very long wire ABDMNDC is shown in figure carrying current I. AB and BC parts are straight, long and at right angle. At D wire forms a circular turn DMND of radius R. AB, BC parts are tangential to circular turn at N and D. Magnetic field at the centre of circle is :

`(mu_(0)I)/(2piR)(pi- (1)/(sqrt(2)))`

`(mu_(0)I)/(2piR)(pi+1)`

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

`(mu_(0)I)/(2piR) (pi+(1)/(sqrt(2)))`

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