Two charges , each equal to q, are kept at `x=-a` and x=a on the x-axis. A particle of mass m and charge `q_0 = q/2` is placed at the origin. If charge `q_0` is given a small displacement `( y lt lt a)` along the y-axis, the net force acting on the particle is proportional to :

Options

A. y
B. `-y`
C. `1/y`
D. `-1/y`

Answer

A