1. Calculate the total number of electrons in a coin of mass of 3.00 grams made of pure copper. Each copper atom has 29 electrons, its atomic weight is 63.5 grams, and density is 8.9 gram / cm^3.
a. If the number of electrons in one of these coins is reduced by 1%, what will be the total positive charge on the coin?
b. If two coins charged in this way (i.e each has a deficit of 1% of the electron) are placed 50 cm apart, what will be the force of repulsion between them?