Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 22 - Think and Explain: 58

Answer

No, it is not necessary for the charged body to actually touch the ball of an electro­scope.

Work Step by Step

You may want to refer to Figure 22.13. If, say, a positively charged object is brought near the ball, some electrons from the leaves are attracted up into the ball, leaving the gold leaves with a net positive charge. The leaves will spread apart. A similar argument explains why the leaves will spread apart when a negatively charged object is brought near the ball. This is an example of charge separation due to induction.
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