Two particles free to move with charges +q and +4q are a distance L apart. A third charged particle is placed so that entire system is in equilibrium. Show that equilibrium is unstable.

Dear Harry,

The detailed solution is given in link below.

http://www.askiitians.com/iit_jee-Electrostatics/Coulombs-Law

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Aman Bansal

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Dear student,

Fing Pot Energy of the system  if its positive then unstable..