[" 40.Two protons are a distance of "1times10^(-10)cm" from each other."],[" The forces acting on them are force "],[" (a) Nuclear force and coulomb force "],[" (b) Nuclear force and gravitational force "],[" (b) Coulomb force and gravitational force "],[" (d) Nuclear,coulomb and gravitational force "],[" (d) Nuclear,coulomb and gravitational force "]