Conceptual Physics (12th Edition)

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

Chapter 22 - Think and Explain: 62


Coulomb's Law is an inverse-square law, meaning the force is inversely proportional to the square of the distance.

Work Step by Step

$$F = k \frac{q_{1} \; q_{2}}{d^{2}}$$ For example, if the distance between the particles is tripled, the force is divided by a factor of 9. On the other hand, if the two charges are brought closer together, reducing their separation distance by a factor of 3, the force is multiplied by a factor of 9.
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