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.
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
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