Conceptual Physics (12th Edition)

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

Chapter 25 - Think and Do - Page 481: 32


This is a hands-on demonstration. Try it and see!

Work Step by Step

Faraday's Law states that the voltage induced in a coil is proportional to the number of loops in the coil, multiplied by the area of each of those loops, multiplied by the rate at which the magnetic field changes within those loops. This is discussed on page 472. If you move the magnet twice as fast, the needle will deflect about twice as much. Or, if you double the number of coils and move the magnet in the same way, the needle should deflect twice as much. A stronger magnet will also increase the amount of deflection.
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