Conceptual Physics (12th Edition)

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

Chapter 24 - Think and Explain: 61

Answer

The charges are of opposite sign.

Work Step by Step

Oppositely charged particles feel forces in opposite directions in an electric field. The same is true of identically-directed particles in magnetic fields. If these particles are deflected in opposite directions (say, one to the east, and one to the west), the charges must be of opposite sign.
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