Physics: Principles with Applications (7th Edition)

Published by Pearson
ISBN 10: 0-32162-592-7
ISBN 13: 978-0-32162-592-2

Chapter 21 - Electromagnetic Induction and Faraday's Law - Questions - Page 617: 7

Answer

See answers. A clockwise current is induced in the second coil.

Work Step by Step

A current will be induced in the second coil. It starts the moment that the battery is disconnected from the first coil. The current in the second loop stops as soon as the flux in it stops changing. This occurs when the current in the front loop reaches its steady-state value, and the magnetic field it creates doesn’t change anymore. At that instant, the magnetic flux through the second loop is constant and the induced current becomes zero. The induced current in the second loop is clockwise. As the battery is disconnected, the number of magnetic field lines going through the second loop, pointing away from you, decreases with time. The induced current in the second loop will cause a field to oppose this change in magnetic flux. The secondary field makes magnetic field lines through the loop that also point away from you, to replace the field that is lost. By the right hand rule, a clockwise induced current appears in the second loop.
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