Conceptual Physics (12th Edition)

by Hewitt, Paul G.

Published by Addison-Wesley

ISBN 10: 0321909100

ISBN 13: 978-0-32190-910-7

Chapter 25 - Think and Explain - Page 482-483: 72

Answer

See below.

Work Step by Step

The hum is a 60 Hz driven oscillation of the iron core in the transformer, as its magnetic polarity is switched 60 times a second.

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