Conceptual Physics (12th Edition)

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

Chapter 22 - Think and Explain: 72


The field is reduced to 1/4 of its original value. Coulomb’s law guides our answer.

Work Step by Step

Use Coulomb's Law to find the force on a test charge q from the isolated point charge. $$F = k \frac{(q_{point})(q)}{d^{2}}$$ If d is doubled, the force on the test charge q is divided by a factor of 4. The field is the force divided by q (page 418), so the field strength is also divided by a factor of 4.
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