d. When two objects made of different materials are rubbed together, one object gains electrons and the other objects gains protons. e . When two objects made of different materials are rubbed together, the total amount of charge among the two objects remains unchanged. 9. Saran Wrap has a larger electron affinity than Nylon. If Nylon is rubbed against Saran Wrap, which would end up with the excess negative charge? Explain. 10. Object A is rubbed with object B. Object C is rubbed with object D. Objects A and D are observed to repel each other. This unit Object B is observed to repel a negatively charged balloon. makes me This is conclusive evidence that ... .D ectatic! * SIGH ... object A acquired a (+. , -) charge. ... object B acquired a (+ , -) charge. ... object C acquired a (+ , -) charge. ... object D acquired a (+ , -) charge. 11. A teacher rubs a glass object and a felt cloth together and the glass becomes positively charged. Which of the following statements are true? Circle all that apply. a. The glass gained protons during the rubbing process. b. The felt became charged negatively during this rubbing process. c. Charge is created during the rubbing process; it is grabbed by the more charge-hungry object. d. If the glass acquired a charge of +5 units, then the felt acquires a charge of -5 units. e. This event violates the law of conservation of charge. f. Electrons are transferred from glass to felt; protons are transferred from felt to glass. g. Once charged in this manner, the glass object and the felt cloth should attract each other. h. In general, glass materials must have a greater affinity for electrons than felt materials. 12. Balloons A and B are suspended from the ceiling by light threads; each balloon is made of rubber. Balloon A was rubbed with animal fur. Balloon B was rubbed with animal fur. If a negatively charged plastic tube were inserted between the two balloons, then one would observe that the two balloons_ . (Refer to the triboelectric series.) a. would deflect even more from a vertical orientation b. would relax to a more vertical orientation c. would not be affected at all by the presence of the plastic tube. The Physics Classroom, 2020 Page 6