Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 16 - Electric Charge and Electric Field - Problems: 6

Answer

2.7 N

Work Step by Step

Coulomb’s law shows us that the magnitude of the force between charges is inversely proportional to the square of the distance between them. If the separation distance is multiplied by a factor of $\frac{1}{8}$, the force is multiplied by a factor of 64. $$F_{new}=64(4.2\times10^{-2}N)=2.7N$$
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