5K20.26 - Lenz's Law - Repulsion Rings

Code Number:
5K20.26
Demo Title:
Lenz's Law - Repulsion Rings
Condition:
Excellent
Principle:
Lenz's Law, Induction
Area of Study:
Electricity & Magnetism
Equipment:
Suspended Aluminum Rings and Magnets.
Procedure:

Suspend the chosen aluminum ring. Insert the magnet into the ring. The solid ring will be move away from the magnet, while the broken ring will show not effect.

References:
  • Roberto Hessel, "More on Faraday's and Lenz's Laws - Qualitative Demonstrations", TPT, Vol. 49, # 3, March 2011, p. 184.
  • Chang Geng Zhang and Shi Feng Hu, "Another Way to Demonstrate Lenz's Law", TPT, Vol. 40, #4, Apr. 2002, p. 249.
  • Don Kangas and Haym Kruglak, "Lenz's Law Demonstration", TPT, Vol. 27, #1, Jan. 1989, p. 50.
  • Thomas D. Miner, "Lenz's Law Demonstration", TPT, Vol. 6, #8, Nov. 1968, p. 427.
  • Robert Ehrlich, "N.3. Pumping a Hanging Coil With a Magnet", Turning the World Inside Out and 174 Other Simple Physics Demonstrations, p. 165 - 166.




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.