10. What is the net charge of the soda can in each case? Explain the reason for your answer. 11. Can you have a net electric force on an object with no net charge? Use your observations of the motion of the soda can to support your answer. Part C: Charging Metals by Contact From now on use the following information to identify charges on the plastic rod and glass rod. Plastic rod rubbed with wool is negatively charged. (plastic negative) Glass rod rubbed with silk is positively charged. (glass positive) Now go back to #6 and identify T and B in terms of + and - 12. Get an electroscope similar to the one drawn below. When the metal leaves have excess charge they repel as shown, when there is no excess charge on leaves they hang vertically down. - Metal sphere First touch the metal sphere once with your nger. Then bring the charged Metal post plastic rod rubbed with wool toward the metal sphere of the electroscope and observe the behavior of the leaves. Do not touch the metal sphere with the plastic rod. Metal leaves Record what you observe when you bring the plastic rod near. What is your model of what is going on that can explain this observation