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Two wires PQ and QR carry equal currents...

Two wires PQ and QR carry equal currents I. One end of each wire extends to infinity and `anglePQR=theta`. The magnitude of the magnetic field at O on the bisector of angle `anglePQR` at a distance r from point Q is

A

`(mu_(0))/(4pi).(I)/(r)sin""(theta)/(2)`

B

`(mu_(0))/(4pi).(I)/(r)cot((theta)/(2))`

C

`(mu_(0))/(4pi).(I)/(r)tan""(theta)/(2)`

D

`(mu_(0))/(2pi).(I)/(r)t((1+cos""(theta)/(2))/(sin""(theta)/(2)))`

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CHHAYA PUBLICATION-ELECTROMAGNETISM -EXERCISE
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