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A current i is flowing in a conductor PQ...

A current i is flowing in a conductor PQRST shaped as shown in the figure. The radius of curved part QRS is r and length of straight portions PQ and ST is very large. The magnetic field at the centre O of the curved part is -

A

`(mu_(0)i)/(4pii)[(3pi)/(2)+1]hat(k)`

B

`(mu_(0)i)/(4pir)[(3pi)/(2)-1]hat(k)`

C

`(mu_(0)i)/(4pir)[(3pi)/(2)+1](-hat(k))`

D

`(mu_(0)i)/(4pir)[(3pi)/(2)-1](-hat(k))`

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