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Point charges + 4q, -q and +4 q are kept...

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

A

Only - q is in stable equilibrium

B

None of the charges is in equilibrium

C

All the charges are in unstable equilibrium

D

All the charges are in stable equilibrium.

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