Two point particles, each of charge Q 1 , are located on the x axis at x

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Two point particles, each of charge Q1, are located on the x axis at x = ± L. Another particle having charge Q2 is now placed at the origin. 

(a) Show that the total force on charge Q2 is zero. 

(b) Suppose Q2 is now moved a very small distance away from the origin, along the x axis. What is the direction of the electric force on Q2

(c) Based on your result in part (b), explain why the origin is, or is not, a point of stable equilibrium for Q2.

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