the ratio of electrostatic force FE to gravitational force FG between two protons each of charge e and mass M; at a distance d is?

A. e/4πԐoGm
B.  e²/Gm²
C. Gm²/4πԐoe²
D. e²/4πԐoeGm²

Correct Answer:

Option D = e²/4πԐoeGm²

Explanation

Electrostatic force = F_E = e²/4λEod²

Gravitational force = F_G = GM²/d²