Conceptual Physics (12th Edition)

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

Chapter 24 - Think and Explain: 55

Answer

The vibrations occur at the same frequency.

Work Step by Step

When the current in the coil increases, it becomes a stronger electromagnet, and feels a stronger force from the permanent magnet. When the current decreases, the coil feels less force. Thus, the mechanical vibrations of the speaker occur in step with the variations in the current.
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