El-3 Repulsion of Like Charges
Published: Tuesday 14 March 2006 - Updated: Thursday 31 March 2011
To demonstrate that like charges repel.
- Pith balls on stand
- Charging rod
- Cats fur
- (Alternatively) Pith Balls and Power Supply
Click on pictures to enlarge.
Pith Balls with Cats Fur and Rod
Pith Balls with Power Supply
A charged rod (rubbed with cats fur in the usual way) is placed in contact with the pith balls. The pith balls are immediately repelled from the rod and each other. Alternatively, a power supply can be used to charge the pith balls.