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Question: Point charges \(+ 4q, - q\) and \(+ 4q\) are kept on the \(x -\)axis at points \(x = 0,x = a\) and \...

Point charges +4q,−q+ 4q, - q and +4q+ 4q are kept on the x−x -axis at points x=0,x=ax = 0,x = a and x=2ax = 2a respectively, then

A

Only qq is in stable equilibrium

B

None of the charges are in equilibrium

C

All the charges are in unstable equilibrium

D

All the charges are in stable equilibrium

Answer

All the charges are in unstable equilibrium

Explanation

Solution

Force on each charge is zero. But if any of the charge is displaced, the net force starts acting on all of them.