Answer
When the coil is waved and twisted in the air, the coil cuts through the Earth's magnetic field.
Work Step by Step
This changes the number of magnetic field lines that pass through the coil, which induces a voltage and a current.
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: 82
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