School of Physics Lecture Demonstration Manual

El-3 Repulsion of Like Charges

Published: Tuesday 14 March 2006 - Updated: Thursday 31 March 2011

Aim

To demonstrate that like charges repel.

Apparatus

Diagrams

Click on pictures to enlarge.

Pith Balls with Cats Fur and Charging Rod

Pith Balls with Electric Charger

Repulsion of Like Charges Diagram

Videos

Pith Balls with Cats Fur and Rod

Pith Balls with Power Supply

Description

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.

Safety notes

Electrical safety 

Maintenance 

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