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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

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a

Only q 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 is C.

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Detailed Solution

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