1. Can an insulator be charged? If so, how would you charge an insulator? If not, why not? 2. A negatively charged electroscope has separated leaves. a. Suppose you bring a negatively charged rod close to the top of the elesctroscope, but not touching. How will the leaves respond? Use both charge diagrams and words to explain. b. How will the leaves respond if you bring a positively charged rod close to the tip of the electroscope, but not touching? Use both charge diagrams and works to explain. 3. A plastic rod that has been charged to -15 nC touched a metal sphere. Afterward, the rod's charge is -10 nC. a. What kind of charged particle was transferred between the rod and the sphere, and in withic direction? That is, did it move from the rod to the sphere or from the sphere to the rod? b. How many charged particles were transferred? 4. Two positive point charges q and 4q are at x = 0 and x = L, respectively, and free to move. A third charge is placed so that the entire three charge system is in static equilibrium. What are the magnitude, sign, and x-coordinate of the third charge