Two equal and opposite charges when placed in electric field attract each other with a force which is-1.)directly proportional to the product of the 2 charges
2.)inversely proportional to the square of distance between them.
3.)depends on the nature of medium
two charges Qa and Qb separated by a distance r will attract each other with a force,
where K is coulumbs constant having value 8.9×
so F can also be written as