Two wires AO and OC carry equal currents i as shown in Fig. One end of both the wires extends to infinity. Angle AOC is `alpha`. The magnitude of magnetic field is point P on the bisector of these two wires at a distance r from point O is

Options

A. `(mu_(0))/(2pi)(i)/(r) cot ((alpha)/(2))`
B. `(mu_(0))/(4pi)(i)/(r) cot ((alpha)/(2))`
C. `(mu_(0))/(2pi)(i)/(r)((1+cosalpha/2))/(sin((alpha)/(2)))`
D. `(mu_(0))/(2pi)(i)/(r)sin((alpha)/(2))`

Answer

A