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Code Number: 5G20.74
Demo Title: Magnetic Flux
Condition: Good
Principle: Magnetic Flux around Magnetic Poles
Area of Study: Electricity & Magnetism
Equipment:
Flux Demo with lasers, White Boards of different surface areas, Fog Machine, LED Starburst unit, Umbrella with ribbon cable, Keithley Electrometer, Butterfly net.
Procedure:
See also: 5B20.50 in Electricity and Magnetism.
Set up the Flux unit as shown. Make sure to tighten the leg set screws securely. Place the surround box around the unit if using the fog machine or fog from the can. Chose the desired size white board which can then be place flat or at any angle in the box to cut as few or as many of the field lines as needed.
The LED Starburst unit can be used to show point charge and radiating point charge simulations.
Point the umbrella toward magnetic north or south. You can also use a dip needle to adjust for the dip angle. When you open the umbrella, the needle on the meter will jump toward the positive as the flux increases. Close the umbrella and the needle goes negative.
The net can be used as a demo for magnetic flux.
References:
- Jeff McManus, "Demystifying Electric Flux and Gauss’s Law", TPT, Vol. 55, #4, Apr. 2017, p. 252.
- Norihio Sugimento, "Umbrella Coil", TPT, Vol. 46, #7, Oct. 2008, p. 443.
- Giuseppe Giuliani, "Electromagnetic Induction: How the "Flux Rule", has Superseded Maxwell's General Law", AJP, Vol. 91, #4, April 2023, p. 278.
- Azar Ali, "Model Helps Pupils to Understand Ideas of Magnetic Fields and Flux", Physics Education, Vol. 39, #3, May 2004, p. 236.
- W. Bolton, "The Flux Density in and Near a Solenoid", Book 4 - Electricity, Physics Experiments and Projects, 1968, p. 50 - 51.
- W. Bolton, "Calibration of a Ballistic Galvanometer as a Fluxmeter", Book 4 - Electricity, Physics Experiments and Projects, 1968, p. 48 - 49.