Answer
See below.
Work Step by Step
The ac magnetic field induces "eddy currents" in the metal piece. The field that results induces a current in the strategically placed large pickup coils, which sets off an alarm.
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: 55
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