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

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

MGIMS WardhaMGIMS Wardha 2007

Solution:

As net force on each charge is zero, therefore all the charges are in equilibrium. If we were to
displace $ -q $ to the right, net force of attraction will be to the right which will displace it further. Therefore, equilibrium is unstable.

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