Conceptual Physics (12th Edition)

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

Chapter 22 - Think and Solve: 36

Answer

5 N.

Work Step by Step

Coulomb's Law is an inverse-square law, meaning the force is inversely proportional to the square of the distance. If the distance between the charges is doubled, the force is divided by a factor of 4. We simply divide 20 N by 4.
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