5E50.30 - Thermoelectric Magnet

Code Number:
Demo Title:
Thermoelectric Magnet
Thermocouple and Electromagnets
Area of Study:
Thermoelectric loop, electromagnet iron core with plate, liquid nitrogen, Bunsen burner or propane torch, masses.

Secure the loop into the iron core with the set screws.  Place one end of the loop into liquid nitrogen for a few minutes.  Then, heat the other end with the propane torch.  After several minutes the electromagnet should be working well enough to  attach the plate and then hang a 1 kg mass off of it.

The following table gives the elements in the thermoelectric series in order:

  • Silicon
  • Bismuth
  • Nickel
  • Cobalt
  • Palladium
  • Platinum
  • Uranium
  • Copper
  • Manganese
  • Titanium
  • Mercury
  • Lead
  • Tin
  • Chromium
  • Molybdenum
  • Rhodinium
  • Iridium
  • Gold
  • Silver
  • Aluminium
  • Zinc
  • Tungsten
  • Cadmium
  • Iron
  • Arsenic
  • Tellurium
  • Germanium

Taken from The Thermoelectric Series

  • E - 340:  "Thermoelec. Magnet & Solar Cubs",  DICK and RAE Physics Demo Notebook.
  • H-374:  "Thermocouple Magnet - Seebeck",  DICK and RAE Physics Demo Notebook.
  • Stanislaw Bednarek, "Thermoelectric Motor", AJP, Vol. 63, #11, Nov. 1995, p. 1051.
  • Adolf Cortel, "Thermoelectric Generators", Physics Education, Vol. 42, # 1, Jan. 2007.
  • R. W. Pohl, "Metals as Conductors of the First Class.  Thermo-electric Pressures", Physical Principles of Electricity and Magnetism, p. 268.
  • Various e-mail correspondence with Adolf Cortel.

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