Two points charge `q_(1)` and `q_(2)(=q_(1)//2)` are placed at points `A(0,1)` and `B(1,0)` as shown in the figure.The electric field vector at point `P(1,1)` makes an angle `q` with the x-axis ,then the angle `q` is
A. `tan^(-1)""((1)/(2))`
B. `tan^(-1)""((1)/(4))`
C. `tan^(-1)""(1)`
D. `tan^(-1)""(0)`