Use this information and figure 3 to answer questions 5 - 7. An electron is initially at location A halfway between the plates of a capacitor, moving in the +x direction at a speed of v; = 2.9 106 m/s. The electron travels along the path shown and collides with the upper plate. Just before striking the upper plate, the electron's speed is vf = 8.4 106 m/s. The radius of the two circular plates of the capacitor and the distance between the plates is given in the diagram. Location D is on the surface of the upper plate, and locations B and C are on the lower plate. 3.5 mm R=4m |- 1.8 mm Figure 3: A capacitor (not drawn to scale). The radius R of the plates is significantly larger than their separation y. An electron starts at position A with speed v; and travels along the dashed line to location D. 5. Which plate is positively charged and which is negatively charged? 6. What is the voltage difference VA - Vc? 7. Calculate the voltage difference Vc - VD.