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Flux as the Flow

Point charges...

Question

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

OPTIONS
1. Only -q is in stable equilibrium
2. All the charges are in stable eqbm
3.all the charges are in unstable eqbm
4. None of the charges are in eqbm

Sir ,please ..do provide the explanation or steps alongwith the right option ..so it's easily understood.

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Similar questions

Point charges +4q, -q and +4q are kept on the X-axis at points x=0,x=a and x=2a respectively. Are all the charges stable or unstable?

+ 4 q, - q

+ 4 q

X - a x i s

X = 0, X = a

X = 2 a

+ 4 q

- q

+ 4 q

x = 0, x = a

x = 4 a

+ 4 q, - q

+ 4 q

(0, 0, 0), (a, 0, 0)

(2 a, 0, 0)

x - a x i s

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