Address

P.O. Box 219 Batavia, IL 60510

Phone 800-452-1261
Fax 866-452-1436
Email flinn@flinnsci.com

Personalize My Experience:

Eddy's Brake - Lenz's Law Demonstration Kit

by Flinn Scientific

Item #: AP7182

Price: $19.05

In the Eddy's Brake and Lenz's Law Demonstration Kit for physical science and physics, investigate how a changing magnetic field generates temporary electric current loops in conducting metals.

See more product details

Product Details

How can you quickly slow down a spinning wheel without touching it? With a magnet of course! A changing magnetic field generates temporary electric current loops in conducting metals. These current loops generate their own magnetic field, even if the metal itself is not magnetic. The magnetic fields from these induced eddy currents alternately repel and attract the external magnet in such a way as to slow down the spinning wheel-as if by magic! Once the wheel stops spinning, it is no longer magnetic. The principle is easy to demonstrate—simply spin the metal disk like a top and then hold the magnet over the rim. The disk will instantly stop rotating. Alternatively, a Bracken's Demonstration Spinner, available separately, may be used to show the continuous stopping power of the eddy currents. Detailed instructions, background information, and student worksheet are provided. Concepts: Electromagnetism, Eddy currents, Lenz's law. Time Required: 15 minutes Materials Provided: Metal disk, plastic lid, neodymium magnet, screw. All the materials are completely reusable! The Bracken's Demonstration Spinner is a recommended accessory but is not required for the demonstration.