Conceptual Physics (12th Edition)

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

Chapter 25 - Think and Explain: 50

Answer

See below.

Work Step by Step

The magnetic domains in the iron core align with the magnetic field created by the current in the armature and field windings. The field of the aligned iron atoms adds to that of the original field, making it even stronger. This increases the torque on the armature.
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