Question

the mass of a typical car is m=1000 kg, so it's weight on the earth's surface is mg=9800N. suppose you have two containers, one with N electrons and another with N protons. These two containers are placed a distance 10 m apart, and the electric force between them is equal to the weight of the car. find N.

Answer 1

$$N=\dfrac{FR^2}{ke^2}=4.25·10^{33}.$$