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Physics Review Question Unit: Electricity and magnetism Year: 1997 Question#: 22 Question: When a plastic rod is rubbed with wool, the wool acquires a positive charge because (1 ) electrons are transferred from the wool to the rod (2 ) protons are transferred from the wool to the rod (3 ) electrons are transferred from the rod to the wool (4 ) protons are transferred from the rod to the wool What is this question really asking? Explanation by: Adam C. [ Return to question menu ] Answer 1 electrons are transferred from the wool to the rod CORRECT Since the wool acquires a positive charge that must mean it looses electrons to the plastic rod. Only electrons are mobile. return to top Answer 2 protons are transferred from the wool to the rod INCORRECT Protons cannot move, only electrons move. return to top Answer 3 electrons are transferred from the rod to the wool INCORRECT If electrons were transferred from the rod to the wool then the wool would have a negative charge. return to top Answer 4 Protons are transferred from the rod to the wool INCORRECT Protons cannot move, only electrons move. return to top What's this question really asking? How does something get a positive charge? return to top |
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