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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.

A

`(1)/(4piepsilon_(0))Q_(1)Q_(2)Q_(3)`

B

`(Q_(1)Q_(2))/(piepsilon_(0))`

C

`(Q_(2)Q_(3))/(piepsilon_(0))`

D

`(4Q_(1)Q_(2))/(piepsilon_(0))`

Text Solution

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The correct Answer is:
C
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