Horseshoe magnet, suspended rings, turntable

Code Number: 5K20.57

Demo Title: Rotating Copper & Aluminum Disks

Condition: Excellent

Principle: Magnetic Induction

Area of Study: Electricity & Magnetism

Equipment:

Horseshoe magnet, suspended rings, turntable or lazy susan.

Procedure:

Place the magnet on the turntable and then suspend the ring between the poles of the magnet. The ring will follow the magnet as if locked in position due to magnetic induction.

References:

P. W. Matthews, "Simple Classroom Demonstration of Lenz's Law and the AC Induction Motor", AJP, Vol. 33, # 12, p. 1082.

Disclaimer

These demonstrations are provided only for illustrative use by persons affiliated with The University of Iowa and only under the direction of a trained instructor or physicist. The University of Iowa is not responsible for demonstrations performed by those using their own equipment or who choose to use this reference material for their own purpose. The demonstrations included here are within the public domain and can be found in materials contained in libraries, bookstores, and through electronic sources. Performing all or any portion of any of these demonstrations, with or without revisions not depicted here entails inherent risks. These risks include, without limitation, bodily injury (and possibly death), including risks to health that may be temporary or permanent and that may exacerbate a pre-existing medical condition; and property loss or damage. Anyone performing any part of these demonstrations, even with revisions, knowingly and voluntarily assumes all risks associated with them.

Instructional Resources and Lecture Demonstrations

5K20.57 - Rotating Copper & Aluminum Disks

Disclaimer