Code Number: 5K20.42
Demo Title: Lenz's Law - Pie Tin, Water, Plate, and Magnet
Condition: Excellent
Principle: Eddy Currents, Magnetic Induction
Area of Study: Electricity and Magnetism
Equipment:
Shallow Pan of Water, Pie Tin, Copper or Aluminum Plate, and Neodymium Magnet.
Procedure:
Place a piece of aluminum or copper plate in a pie tin, and float this in a large pan of water. A neodymium magnet brought near the plate and moved around or rotated will show the induction that the magnet produces in the plate.
References:
- Thomas B. Greenslade Jr., "Apparatus Named After Our Academic Ancestors, III", TPT, Vol. 52, # 6, Sept. 2014, p. 360.
- Wojciech Dindorf, "Lenz's Law in the Kitchen", TPT, Vol. 37, # 5, p. 268, May 1999.
- D. S. Ainslie, "Demonstration Experiment in Electromagnetic Induction", AJP, Vol. 19, #4, April 1951, p. 232.
- B-287: "Eddy Currents - Rotate Pie Pan - Nd Magnet Lift", DICK and RAE Physics Demo Notebook.
- Rudolf F. Graf, "Build an Eddy Current Motor", Safe and Simple Electrical Experiments, p. 68.