Calculate the distance between two protons such that electrical repulsive force between them is equal to the weight of either.

calculate the Coulomb.s force between two protons separated by 1.6xx10^-15m

The force between two equal charges placed in a medium at a distance of 9 cm from each other is 16 dyne. On increasing one of the charges by 56 statC, it is found that the distance between the charges must be changed by 3 cm in order to keep the force between them the same Calculate the magnitude of the charges and the dielectric constant of the medium . Given : 1 C = 3 xx 10^9 statC .

The distance between two stations is 240 km. A train takes 4 hours to cover this distance. Calculate the speed of the train?