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Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538

Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography


Due to Physics Building renovations, the lead time to set up demo requests has increased due to the need to transport equipment across campus. Please be kind and let me know well ahead of time what you need.

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 Electric Fields And Potential
 Current and Resistance
 Electromotive Force And Current
 DC Circuits
 Magnetic Materials
 Barkhausen Effect
 Diamagnetic Levitation
  video  - Hysteresis
 Curie Point
 Meissner Effect (diamagnetic levitation)
 Complex Circuits
 Semiconductors And Tubes
 Transmission Lines and Antennas

 video  - Hysteresis


To show the hysteresis curve for various ferromagnetic samples and the lack of hysteresis for non-magnetic materials.


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  DEMO VIDEO DOWNLOAD w/ sound / 1920x1080 / 24.19Mb/s / 656MB size  

  DEMO VIDEO DOWNLOAD w/ sound / 854x480 / 5.69Mb/s / 154MB size  

The MCI Hysteresis Apparatus Manual describes the fundamentals of this demo. Plug the transformer unit into the variac so the voltage can be adjusted. The circuit unit has four leads, 2 of which (A and B), are plugged into their respective scope channels. The other two are plugged into the primary and secondary of the transformer as marked. Set the scope to the A vs. B mode and slowly bring up the ac voltage. Some range adjustment is necessary to obtain the best trace since different samples require different voltages to get the trace to look "right".


Sometimes, the setup makes some loud buzzing noise at the transformer (depending what metals one uses and how it is coupled across the transformer core) and tends to get hot with long use.


  • Oscilloscope
  • M.C.I. hysteresis apparatus (2 units)
  • Variac
  • Various Metal Bars