## Conceptual Physics (12th Edition)

Published by Addison-Wesley

# 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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