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1. The problem statement, all variables and given/known data

Is there a difference b/w stable equilibrium and just equilibrium (of charged particles)? My hw problem exactly is:

2 small beads with charge +3q and +q each is fixed at opposite ends of a horizontal insulating rod. If a third charge is placed in between the two charges on the rod, at what position is the third bead in equilibrium? Can it be in stable equilibrium?

3. The attempt at a solution

I was able to calculate stuff for the first question and found the position... but I don't really know what the second question is asking.

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# Stable equilibrium and net force

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