Shallow Pan of Water, Pie Tin, Aluminum Plate, and Neodymium Magnet

 

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.
5K20.42 - University of Maryland QOTW #349