Code Number: 5G40.21

Demo Title: Simple Hysteresis

Condition: Excellent

Principle: Forces & Fields In and Around Coils

Area of Study: Electricity & Magnetism

Equipment:

0 to 20 VDC Power Supply, Large 6' Diameter Coil, Steel Rods with Strings.

Procedure:

Set the coil on its side and hang two of the rods in the center of the coil. With no power the rods will touch in the center of the coil. Turn up the voltage and the rods will separate a distance that is proportional to the voltage. Turn off the power and observe that the rods still retain some residual magnetism.

References:

Harald C. Jensen, "New Demonstration of Hysteresis Loop in Iron", AJP, Vol. 25, #6, June 1957, p. 384.

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

5G40.21 - Simple Hysteresis

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