A negative point charge -2q and a posit...

A negative point charge ` -2q` and a positive charge `q` are fixed at a distance `l` apart. Where should a positive test charge `Q` be placed on the line connecting the charge for it to be in equilibrium ? What is the nature of the equilibrium with respect to longitudinal motions ?

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The correct Answer is:

`A=L(1+sqrt(2))`, the equilibrium will be stable

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