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Two particles (free to move) with charge...

Two particles (free to move) with charges `+q` and `+4q` are a distance L apart. A third charge is placed so that the entire system is in equilibrium.
(a) Find the location, magnitude and sign of the third charge.
(b) Show that the equilibrium is unstable.

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PHYSICS GALAXY - ASHISH ARORA-ELECTROSTATICS-Partice Exercise
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