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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Mechanics
Fluid Mechanics
Oscillations And Waves
Thermodynamics
Electricity And Magnetism
Optics
Modern Physics
Audio-Visual
New or Modified Entries (within the last month)

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Electrostatics
Electric Fields And Potential
Capacitance
Current and Resistance
Electromotive Force And Current
DC Circuits
Magnetic Materials
Magnetism
Inductance
Induction: 1x 2x 4x Coils and Bar Magnet; video - Hanging Ring and Magnet; Flash Bulb Coil; video - LED Coil; video - Eddy Current Pendulum; video - Lenz's Law and Eddy Currents; video - Eddy Current Tube; video - Jumping Ring; Eddy Current Levitation; Eddy Current Levitation 2; Eddy Currents 2; video - Transformers; Electric Motor; Hand Crank Generator; Bicycle generator
Complex Circuits
Semiconductors And Tubes
Transmission Lines and Antennas

video - LED Coil

Purpose:

To show that the direction of the induced current depends on whether the magnetic flux through the coil is increasing or decreasing

Procedure:

DEMO VIDEO DOWNLOAD

SETUP: The RED and GREEN LED's are connected to the coil in parallel with their directions reversed. The red diode lights up when a current is present in one direction while the green diode lights up for a current in the opposite direction. Inserting and removing the magnet from the coil will light up one diode then the other.

Hints:

Equipment:

Coil w/ 2 LED's
Permanent Magnet