Hi can you guys please answer these four conceptual questions i am struggling to understand on the etext.Thanks

Conceptual Questions 1. A plastic rod that has been rubbed with wool and a glass rod that has been rubbed with silk hang by threads. a. An object repels the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not? b. A different object attracts the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not? 3. As shown in Figure (221.39, metal sphere A has 4 units of negative charge and identical metal sphere B has 2 units of positive charge. The two spheres are brought into contact. What is the nal charge state of each sphere? Explain. 6. A plastic balloon that has been rubbed with wool will stick to a wall. Can you conclude that the wall is charged? If so, where does the charge come from? If not, why does the balloon stick? 7. A hummingbird gains a significant electric charge while flying. This has consequences: When a charged bird approaches a flower, the stamens of the flower bend toward the bird, even though the stamens are uncharged. Explain how this happens