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  4. Point charges +4q, - q and +4q are kept on the X -axis at point x = 0 and x = 2a respectively.

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Q. Point charges +4q, - q and +4q are kept on the X -axis at point x = 0 and x = 2a respectively.

AIPMTAIPMT 1988Electrostatic Potential and Capacitance

Solution:

At the present position all the charges are in equilibrium. But when they displaced slightly from their present position, they do not return back. So, they are in unstable equilibrium position.