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.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 22 - Think and Explain - Page 427-428: 84
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