Al Tobias (wat4y) - Office: Gibson S123 & Physics 218, (434) 924-0538
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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You have selected the following Demos:
video - Hysteresis
Purpose:To show the hysteresis curve for various ferromagnetic samples and the lack of hysteresis for non-magnetic materials.
The MCI Hysteresis Apparatus Manual describes the fundamentals of this demo. Plug the transformer unit into the variac so the voltage can be adjusted. The circuit unit has four leads, 2 of which (A and B), are plugged into their respective scope channels. The other two are plugged into the primary and secondary of the transformer as marked. Set the scope to the A vs. B mode and slowly bring up the ac voltage. Some range adjustment is necessary to obtain the best trace since different samples require different voltages to get the trace to look "right".
Hints:Sometimes, the setup makes some loud buzzing noise at the transformer (depending what metals one uses and how it is coupled across the transformer core) and tends to get hot with long use.