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Point charges +4q, -q are kept on the x-...

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

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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