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Homework Statement
The figure below shows charged particle are fixed in place on an axis. In which situation is there a point to the left of the particles where an electron will be in equilibrium?
Homework Equations
[itex]F=\frac{KQ_1Q_2}{r^2}[/itex]?
The Attempt at a Solution
The solution says 'In case of (a) and (b), the electron will be in equilibrium because both have equal magnitude of charges and have opposite polarity'. The problem is I don't see this. When I tried to do this mathematically, I didn't get [itex]F=0[/itex]. Can someone explain how this works. Surely, the other charge [itex]\pm 3q[/itex] also plays a part and hence equilibrium will not be produced.