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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
 Magnet collection
  video  - Magnetic Fields w/ Iron Filings
  video  - Magnetic Fields w/ Matrix of Iron Rods
  video  - Magnetic Fields Associated with Current Carrying Wires 1
  video  - Magnetic Fields Associated with Current Carrying Wires 2
  video  - Solenoid w/ Iron core
  video  - Magnetic Deflection of an Electron Beam
  video  - e/m Tube Lorentz Force Demonstrator
 Magnetohydrodynamic Motor
  video  - Forces Between Current Carrying Wires
  video  - Vibrating Lamp Filament
  video  - Force on a Current Carrying Wire in a Magnetic Field
 Hall Effect
  video  - Galvanometer Movement
 Complex Circuits
 Semiconductors And Tubes
 Transmission Lines and Antennas

Hall Effect


To demonstrate the Hall effect.


This demo utilizes the Leybold Hall Effect Apparatus.

Connect a digital voltmeter across Uh Hall voltage terminals on the hall effect apparatus (zero voltmeter). Wire our Lambda power supply in series with the silver (Ag) conductor strip. Run 10A current (set V=0.52V) thru foil.

Wire a rheostat in series with the TENMA DC power supply and the metal plate of the hall effect apparatus. Unscrew the rheostat and set the voltage on the power supply to 13.8V. Screw in the rheostat till the current is 10A and adjust the apparatus' black knob so that the voltmeter reads 0V across the plate. Lower the apparatus between the poles of a large horse shoe magnet and observe the voltage on the voltmeter change. Adjust the rheostat to draw more current and observe the voltage across the metal plate change again.


The observed voltage is very small on the order of 50uV so one needs a very sensitive voltmeter.


  • Carbon rheostat
  • DC Regulated Power Supply
  • Hall Effect Demonstrator
  • Voltmeter