Van de Graaff with Aluminum Plates
Shows that 'like' charges repel. Use double sided tape
fasten an aluminum foil pie plate to the top of a Van de Graaff
Then stack a dozen more foil plates on top of the first one. When the
de Graaff is turned on the plates float off one at a time, except of
for the taped on one.
de Graaff with Person and Plume
In this classic demonstration a person is insulated
the ground by standing on a board supported by four dry drinking
then charged up to many thousand volts. This demonstration is best done
with caution. We've been told that metal in shoes and under the
floor, can cause discharge and an alarming, though not dangerous,
Make sure the person is not using a pacemaker. This demostration works
best with long, straight, fine hair. Their hair will stand on end if
and dry. This again shows that like charges repel, but it also shows
voltage and energy are not the same, and that a complete circuit is
for a sustained current.
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