Conceptual Physics (12th Edition)

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

Chapter 22 - Think and Explain: 84

Answer

The field is zero because the force on the test charge is zero.

Work Step by Step

If a test charge were placed there, it would feel an equal force from each point charge, but the forces would be oppositely directed, and cancel out.
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