1. A glass object receives a positive charge of +3 nC by rubbing it with a silk cloth. In the rubbing process, have protons been added to the object or have electrons been removed from it? How do you know? 2. Consider a conductor in electrostatic equilibrium, and answer the following 3 questions. a) Why is the net charge always zero inside the surface of the conductor? b) Why is the electric field always zero inside the surface of the conductor? c) Why is the charge density on its surface highest where the surface is sharpest? 3. If a suspended object is attracted to a charged object, can we conclude that the suspended object is charged? Explain. 4. How does the Coulomb force compare to the Gravitational force? Similarities? Differences? 5. A charged comb often attracts small bits of dry paper that then fly away when they touch the comb. Explain why that occurs