Hysteresis Demo Unit
Data from Hysteresis Demo
Hysteresis

 

Code Number: 5G40.10

Demo Title: Hysteresis

Condition: Excellent

Principle: Properties of Magnetic Materials

Area of Study: Electricity & Magnetism

Equipment: 

Variac, Oscilloscope, Overhead Circuit Diagram, and Hysteresis Demo Unit.

Procedure:

The unit is designed for a maximum of flexibility in circuit values.  The capacitance box and the variable pot allow the demonstrator to show the affect on the hysteresis curve when these values are changed.  Plug the outlet plug into a Variac.  The BNC cords are labeled and are connected to the appropriate channel of the oscilloscope.  Refer to the circuit diagram for assistance if anything becomes unplugged or rearranged.  Turn on the Variac to around 70.  Adjustment of the capacitor and/or the variable pot may be needed to obtain the best curve although it is usually left on the proper setting when stored.  It is normal that the 3 large resistors on the demo board will become quite hot so do not become alarmed.  Care should be taken not to touch them when in this condition however.

References:

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  • Paul Gluck, "Low-Cost Kit Makes Magnetic Hysteresis Demonstration Easy", Physics Education, Vol. 39, #2, Mar. 2004, p. 125.
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  • "Hysteresis Curve for Steel Ring", Selective Experiments in Physics, CENCO, 1962.
  • "Magnetization and Hysteresis Curves for an Iron Rod", Selective Experiments in Physics, CENCO, 1962.
  • William J. Hamm, "Physics Experiment #2: The Determination of the B vs. H Curves and the Hysteresis Loop of Magnetic Materials by the Rowland Ring Ballistic Step Method", Keithley Instruments, Series II.