Rub together two different
insulators to give
them opposite charges. Demonstrate their effects on an
electroscope
or hanging aluminum ball or a pair of pith balls.
NOTES
Pairs of materials that
have
been
found to
work well:
rabbit fur(+) and rubber rod(-)
wool(+) and rubber rod(-)
rabbit fur(+) and styrofoam
block(-)
silk(-) and glass rod(+)
acrylic or nylon rod and
plastic
bag
Other possibilities:
positive
rabbit fur
glass
mica
wool
silk
cotton
styrofoam
wood
amber
rubber
celluloid
negative
Nylon thread and fishing line are
good insulators
for suspending charged things.
