If you shine an ultraviolet light on the metal ball of a negatively charged electroscope (shown in

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If you shine an ultraviolet light on the metal ball of a negatively charged electroscope (shown in Exercises 11 and 12 in Chapter 22), it will discharge. But if the electroscope is positively charged, it won't discharge. Can you venture an explanation?
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Conceptual Physics

ISBN: 978-0321568090

11th edition

Authors: Paul G. Hewitt

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