1. The dwarf planet Pluto has a radius of 1.15 x 106 m and a mass of 1.2 1022 kg. What is the value of g on the surface of Pluto? [2 marks] 2. If a 1.5 x 10-6C charge exerts a electric force of 1.9 N on a 3.2 10-4C charge, how far away are they located? [2 marks] 3. What is the electric field intensity 0.5 m away from a small sphere with a negative charge of 1.6 10-8C? [Note: Direction is outward or inward] [2 marks]