Two charges `-q` each are separated by distance `2d`. A third charge `+q` is kept at mid-point O. Find potential energy of `+q` as a function of small
Two charges `-q` each are separated by distance `2d`. A third charge `+q` is kept at mid-point O. Find potential energy of `+q` as a function of small distance `x` from O due to `-q` charges. Prove that the charge at O is in an unstable equilibrium.
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