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Two charges -q each are separated by dis...

Two charges `-q` each are separated by distance `2d`. A third charge `+q` is kept at mid-point O. Find potential energy of `+q` as a function of small distance `x` from O due to `-q` charges. Prove that the charge at O is in an unstable equilibrium.

Text Solution

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The correct Answer is:
`(-q^(2))/(4piepsilon_(0))(2d)/((d^(2)-x^(2)))`
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