Electrostatic Attrac And Repuls - Charged Cylinders

Purpose

To demonstrate electrostatic attraction and repulsion.
 

Equipment

Stand with two glass test tubes and hard rubber rod on strings, silk, fur.

 

Images

j1-21

Description

Charge the glass cylinders positive by rubbing with silk, and charge the hard rubber cylinder negative by rubbing with fur. The two positive glass cylinders repel each other, but both are attracted to the negative hard rubber cylinder.◙
 

References

Walter Roy Mellen, Inexpensive Electrostatics Halos, TPT 28, 612-613 (1990).