5A40.10 Charging by Induction
Coulomb repulsion, grounding
The Project-o-scope can be charged by induction by bringing a charged rod close to it and touching the metal disc with a finger. The Project-o-scope will deflect its needle in response.
-  Project-o-scope
-  Cellophane
-  Glass rod
-  Rabbit fur
-  PVC rod
-  Box of matches
-  Lighter
- As with most electrostatic demonstrations, this works best on cool, dry days.
- Fur on PVC gives the rod a positive charge.
- Cellophane on glass gives the rod a negative charge.
- Rub the fur on the PVC rod.
- Bring the PVC rod close to the metal disc.
- Tap the Project-o-scope plate with your finger. The Project-o-scope needle should deflect.
- Rub the cellophane on the glass rod.
- Bring the glass rod close to the metal disc. The needle should go back towards 0.
- Light a match or ignite the lighter near the plate of the Project-o-scope to discharge it.
- PIRA 5A40.10
- Don't attempt this at home!
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.