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A system of to charge particles are held at a fixed distance. The distance between these...

A system of to charge particles are held at a fixed distance. The distance between these two particles is in double. As a result of this change, the electric potential of the system. Can someone tell me if the magnitude of the coulomb force between these two particles increases or decreases? AND if the coulomb force between those 2 particles attract or repulse each other?
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