University Physics with Modern Physics (14th Edition)

Published by Pearson
ISBN 10: 0321973615
ISBN 13: 978-0-32197-361-0

Chapter 29 - Electromagnetic Induction - Problems - Discussion Questions - Page 980: Q29.1


The force is due to eddy currents.

Work Step by Step

The conductor moving within the magnetic field will have eddy currents produced in it, as explained on page 972, due to electromagnetic induction. Lenz’s Law tells us that the currents experience a magnetic force that opposes the motion of the disk, causing a braking action. The faster the disk is pulled, the more rapidly the magnetic flux is changing, the larger the eddy currents, and the greater the braking action. An identical argument applies when the sheet is inserted between the poles, so a force is indeed required to insert the sheet.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.