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A hairpin like shape as shown in figure ...

A hairpin like shape as shown in figure is made by bending a long current carrying wire. What is the magnitude of a magnetic field at point P which lies on the centre of the semicircle ?

A

`(mu_(0)I)/(2pi r)(2-pi)`

B

`(mu_(0)I)/(4pi r)(2+pi)`

C

`(mu_(0)I)/(4pi r) (2-pi)`

D

`(mu_(0)I)/(2pi r)(2+pi)`

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