Conceptual Physics (12th Edition)

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

Chapter 25 - Think and Explain: 54

Answer

No. Yes.

Work Step by Step

The Earth’s magnetic field within the embedded loop does not change, but the magnetic field within the loop does change due to the car’s movement. A pulse is produced. This could be used to detect when cars are waiting in the left-hand turn lane, and trigger the left-turn arrow on the traffic light. Consider the wide loop of wire embedded in the road. When the iron chassis of a car passes over the loop, that will momentarily change the strength of the magnetic field in the loop. The law of electromagnetic induction tells us that a pulse of voltage will be induced in the loop, which induces a current.
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