Physics for Scientists and Engineers: A Strategic Approach with Modern Physics (3rd Edition)

Published by Pearson
ISBN 10: 0321740904
ISBN 13: 978-0-32174-090-8

Chapter 25 - Electric Charges and Forces - Conceptual Questions: 3

Answer

Ball A has a negative charge. Ball B is neutral. Ball C has a positive charge. Ball D is neutral.

Work Step by Step

When a plastic rod is rubbed with wool, electrons move from the wool to the rod, so the rod becomes negatively charged. When the rod touches ball A, then ball A becomes negatively charged. Since balls B, C, and D are attracted to ball A, they could be positively charged or neutral. Since balls B and D have no effect on each other, they must both be neutral. Since ball B (which is neutral) is attracted to ball C, then ball C must be positively charged.
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