5A10.10 Electrostatic Charges (Projectoscope)

Concepts

Separation of electric charge by friction between two neutral materials

Overview

Rubbing a sheet of cellophane (plastic) on a glass rod makes the rod positive and the cellophane negative. Rubbing a rabbit fur on a PVC rod makes the rod negative and the fur positive. When the rod touches the Project-o-scope, electrical charge flows to the Project-o-scope and the arrow deflect. Lighting a match near the Project-o-scope plate causes the charge to be neutralized and the arrow return to zero.

Details

Equipment

  • [1] Project-o-scope
  • [1] Cellophane
  • [1] Glass rod
  • [1] Rabbit fur
  • [1] PVC rod
  • [1] Box of matches
  • [1] Lighter

Important Notes

  • As with most electrostatic demonstrations, this works best on cool, dry days

Script

  1. Rub the fur on the PVC rod.
  2. Touch the Project-o-scope plate with the rod.
  3. Light a match or ignite the lighter near the plate of the Project-o-scope to discharge it.
  4. Repeat step 1 to 3 using a cellophane sheet and a glass rod.

 

Additional Resources

References

  • PIRA 5A10.10

Disclaimer

  • Don't attempt this at home!

Last revised

  • 2018

Technicals

Related AV

Related demos

 

If you have any questions about the demos or notes you would like to add to this page, contact Ricky Chu at ricky_chu AT sfu DOT ca.