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 - Charging by Induction
Purpose:To demonstrate charging of objects by induction.
Use the "Faraday Ice Pail "cage as a reliable electroscope that also measures the charge sign.
Rub Teflon stick on silk (Teflon = negative charge) or glass/Lucite on Teflon wrap (glass/Lucite = positive charge) and transfer it to the "Pith Ball on a Stick" by touching. Measure the charge with electroscope.
Next, reset the electroscope (ground Faraday cage w/ lever) and charge the "Pith Ball on a Stick" by induction. Do so by short circuiting the pith ball to the grounded outer metal cage. Bring the charged object close and "disconnect" the ground by removing the "Pith Ball on a Stick" from the outer cage. Demonstrate on the electroscope that the charge on the ball is now opposite to what it was while charged by touching.