1) A proton is suspended in a vacuum between two oppositely charged horizontal parallel plates. The separation between the plates is 2.60 mm. a. What is the sign of the charge on the lower plate? b. What is the voltage across the plates? 2) Two conducting spheres are connected by a thin wire and are in electrostatic equilibrium. The diameter of the smaller sphere is 3.20 cm and the diameter of the larger one is 9.00 cm. If the smaller sphere is found to be charged to 2.30 nC, what is the charge of the larger sphere?