Conceptual Physics (12th Edition)

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

Chapter 22 - Think and Explain: 86

Answer

Physicists have defined the direction of an electric field at a point to be the direction of the force on a positive test charge when it is placed there.

Work Step by Step

A positive test charge placed near a proton will be repelled. The electric field vector points away from the proton.
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