Objective:
– To show an analogy of the electric field or the electric lines of force surrounding conductors of selected geometry.
Apparatus:
- Electric field
platform
- single point pattern
- two points (opposite charge) pattern
- hollow sphere (section) pattern
- coaxial pattern
- parallel plates pattern
- plate and points pattern
- Wimshurst machine
- Transformer Oil
- Grass seed
- Leads
Method:
The platform with the bottom half of a Petri Dish is placed on the O.H. Projector, and connected to the electrodes of the Wimshurst Machine. About 1 cm depth of oil is added, and the desired conductor shapes are plugged in and immersed in the oil. Grass seed is sprinkled lightly and evenly on the oil. The O.H. Projector is focused on the layer of seeds.
The Wimshurst Machine is then cranked one or two times (only), setting up a potential gradient between the conductors. The seeds become charged and align along the electric lines of force.