Exercise 1 : Applying Coulomb's Law 1. State the definition of Coulomb's Law using 3. Two charges, one of charge +4nC, the words. other of charge -8nC, are 40mm apart. a) What is the force exerted on the 4nc charge by the -8nC charge 2. Calculate the force between an electron and : a) A Proton 2.5x10-9m a) Determine how far from the 4nC charge you would have to go to reach a potential of 0 b) A Helium nucleus at 2.5x10-9m