The force between two short electric dipoles separated by a distance r is direcly proportional to :

The force between two electrons separated by a distance r is proportional to

The force between two electrons separated by a distance r is proportional to

The force between two electrons separated by a distance r varies as

The force between two electrons separated by a distance r varies as

The force between two electrons separated by a distance 'r' is proportional to

Suppose that the gravitational force between two bodies separated by a distance R becomes inversely proportional to R (and not as (1)/(R^(2)) as given by Newton's law of gravitation). Then the speed of a particle moving in a circular orbit of radius R under such a force would be proportional to

Force between two charges separated by a distance r varies as r^(2) ?

Force between two charges q_1 and q_2 separated by a distance r is proportional to q_1q_2//r^(2). Proportionality constant is