Electrostatic Attrac And Repuls - Wimshurst Machine
To demonstrate electrostatic attraction and repulsion.
Wimshurst machine, two conducting balls suspended by wires.
Two conducting balls suspended from the two arms of the Wimshurst machine are oppositely charged and attract each other. The same two balls suspended from a single arm of the machine will repel each other.
Markus Zahn, Richard L. Goslin, and Larry F. Wicks, Self-Excited, Alternating, High-Voltage Generation Using a Modified Electrostatic Influence Machine, AJP 42, 289-294 (1974). ◙G. B. Putz, The Wimshurst Machine, Popular Electronics, December 1990, pp. 29-32. ◙Central Scientific Company catalog information sheet.