The system, which I am going to discuss, consists of a large number of particles (electrons) of equal mass arranged in a circle at equal angular intervals and repelling each other with forces inversely proportional to the square of distance (Coulomb law); at the centre of the circle, place a particle of large mass attracting the other particles (electrons) according to the same law of force.
This structure is somewhat similar to the solar system, since an attractive force between the nucleus and electrons is caused by the Coulomb law, being inversely proportional to the square of the distance between them.