The electric charge on each square centimeter of the Earth's surface is 9.6x10-18 Coulombs. We use the equation for the total charge Q if there are n that is equal to 60 electrons on each square centimeter of surface:
Q = ne-
We know that the charge e- on one electron is 1.6 x 10^-19 Coulombs.Therefore, the total electric charge Q is
Q = (60) (1.6 x 10^-19 C)= 9.6 x 10^-18 Coulombs
