Conceptual Physics (12th Edition)

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

Chapter 22 - Think and Explain: 63

Answer

The negatively charged electrons are attracted to the $5 \times 10^{22}$ positively charged protons that are also present in the penny, so they don't fly out of the penny.

Work Step by Step

If the protons weren't present, i.e., if one simply had a penny-shaped cloud of electrons, the electrons would repel each other and be scrambling to get out of there as soon as possible.
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