Physics Demo Manual

Demonstrations are cataloged according to PIRA Bibliography

PLEASE REQUEST DEMOS WELL IN ADVANCE

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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Electrostatics
Electric Fields And Potential
Capacitance
Current and Resistance
Electromotive Force And Current
DC Circuits
Magnetic Materials
Magnetism: 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
Inductance
Induction
Complex Circuits
Semiconductors And Tubes
Transmission Lines and Antennas

Hall Effect

Purpose:

To demonstrate the Hall effect.

Procedure:

This demo utilizes the Leybold Hall Effect Apparatus.

LAMBDA POWER SUPPLY:
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.

TENMA POWER SUPPLY:
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.

Hints:

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

Equipment:

Carbon rheostat
DC Regulated Power Supply
Hall Effect Demonstrator
Voltmeter