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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Barkhausen EffectPurpose:An audible demonstration of the sudden alignment of magnetic domains in a ferrous material.Procedure:Three rods are supplied: copper, aluminum and iron. Only iron, being a ferrous material will exhibit the effect. place a rod into the coil and rotate the magnet in front of the rod. Each time a domain flips, the change of the magnetic field in the coil causes a small voltage spike which is picked up in the amplifier. As the magnetic field is reversed, a hissing sound is heard from the amplifier. This is the sound of the flipping magnetic domains in the material.Hints:use microphone preamp, Low Z input. Needs a lot of gain.Equipment:
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