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**"stable equilibrium"**

**1. Homework Statement**

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.