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In a system of unlike charges +q and -q

where r is the distance between point charges

In a system of like charges +q and +q or -q and -q

where r is the distance between point charges

so charges are more stable at less energy

so a charge has less energy when it is close to another opposite charge

more the closer it is lesser the energy so opposite charges attract each other

When a charge is close to another like charge it is at high energy so they repel

as distance between them increases energy between them decreases

when charge close to another like charge there is increase in energy repel each other

as distance increase and energy decrease........hope this will help u!!!!!!!!!!!!!