Two point particles, each of charge are located on the x axis at Another particle having...

Two point particles, each of charge are located on the x axis at Another particle having charge is now placed at the origin. (a) Show that the total force on charge is zero. (b) Suppose is now moved a very small distance away from the origin, along the x axis. What is the direction of the electric force on ? (c) Based on your result in part (b), explain why the origin is, or is not, a point of stable equilibrium for .