Electricity and Magnetism > Electrostatics > Induced Charge
DCS# 5A40.30

ROTATING 2" x 4"

 


APPARATUS
 
long 2" x 4" 202-18-B
big convex lens 202-18-B
rabbit fur 202-18-D3
styrofoam block 202-18-D6


DESCRIPTION A 2"x4" is balanced, metal plate side down, on a convex lens so that it can rotate freely.  The styrofoam block is charged by rubbing it with rabbit fur.  The attractive force between the charged styrofoam and the neutral 2"x4" is large enough to swing the 2"x4" in a horizontal plane. NOTES Big convex lens would be hard to replace.  Handle with care.