Al Tobias (wat4y) - Office: Rm. 201, (434) 924-0538 - Lab: Rm. 202, (434) 924-6800
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:
Purpose:To demonstrate magnetohydrodynamic forces.
Procedure:A glass bowl with two parallel electrodes is filled with salt water, just enough to cover the electrodes. A DC power supply is connected to the electrodes. A neodymium disc magnet is placed under the bowl and centered with the electrodes which provides a vertical magnetic field. Applying 8 to 12V to the electrodes will cause water to stream between them. The water's motion can be made more apparent with saw dust, lycopodium powder or a drop of dye.
Hints:Flip the magnet or reverse polarity of the electrodes to reverse direction of the flow.