Conceptual Physics (12th Edition)

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

Chapter 25 - Think and Explain: 80

Answer

The moving magnet induces a current in the coil.

Work Step by Step

This induced current produces a field that repels the magnet as it approaches, and attract it after it passes through, in both cases slowing it down. From an energy standpoint of view, the induced current heats the coil. This energy ultimately comes from the kinetic energy of the moving magnet, which must slow down.
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