Last winter, I gave a presentation on this topic at a Southern CA American Association of Physics Teachers meeting. The purpose of my presentation was the following: I have reviewed some of the methods surrounding the “Grass Seeds in Mineral Oil” Electric Field Demonstration and am advocating for a simpler, user-friendly, inexpensive method that enables a more interactive and engaging demonstration.
In the following ppt, I share the motivation for creating this demonstration, how to set up the demo, and teaching tips to make this demo easier for teachers to perform and share with students.
The following supplies are needed:
- Lettuce Seeds (black, pointy)
- Vegetable Oil (yellow, like amber)
- Van de Graaff or Fun Fly Stick
- Microscope Cam & LCD Projector
Once again, this video shows the outcome.