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Build Your Own
Electric Field Demonstrator
February 6, 2012
James Lincoln, MS MEd
Tarbut V’ Torah HS
Irvine, CA
Build Your Own
Electric Field Demonstrator
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Abstract
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.
I have also focused on utilizing
freely available materials so that
this apparatus can be produced
with likely zero additional cost
to the teacher.
![Page 3: Build Your Own Electric Field Demonstratorphysicsvideos.tripod.com/e-field-oil.pdfJames Lincoln, MS MEd Tarbut V’ Torah HS Irvine, CA Build Your Own . Abstract Seeds in Mineral Oil”](https://reader033.vdocuments.net/reader033/viewer/2022050519/5fa309fbe79bdf27c17284b9/html5/thumbnails/3.jpg)
Some Grass E-Field Images (these ones are in vegetable oil).
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Introduction & Motivation
Despite having taught physics for several years previous, I
had neither performed nor witnessed live the Electric Field
Visualization Demonstration.
I have long known from text
book images and catalogues
that such a demonstration
existed, but resisted in
attempting it because
I had thought that the demo
involved some fancy
equipment or techniques.
continued…
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Introduction & Motivation
Upon purchasing one of the E-Field Demonstrators, I found that the
demo enriched my instruction and improved my students’
visualization of the Electric Field.
I also realized that this exciting demo
could have been easily constructed with materials I already had
lying around the classroom.
Therefore, with a little advice, I will show that one can easily replicate
the same results as the catalogue ordered design.
Also I have some TIPS for how to get the best results.
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Past Methods vs. Updated Methods
Past Methods
•Grass Seeds (grey dots)
•Mineral Oil (clear)
•HV Source or Wimshurst or HV Gun
•Overhead Projector
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Past Methods vs. Updated Methods
Past Methods
•Grass Seeds (grey dots)
•Mineral Oil (clear)
•HV Source or Wimshurst or HV Gun
•Overhead Projector
RESULT: A stagnant, clear image
![Page 8: Build Your Own Electric Field Demonstratorphysicsvideos.tripod.com/e-field-oil.pdfJames Lincoln, MS MEd Tarbut V’ Torah HS Irvine, CA Build Your Own . Abstract Seeds in Mineral Oil”](https://reader033.vdocuments.net/reader033/viewer/2022050519/5fa309fbe79bdf27c17284b9/html5/thumbnails/8.jpg)
Past Methods vs. Updated Methods
Updated Method
•Lettuce Seeds (black, pointy)
•Vegetable Oil (yellow, like amber)
•Van de Graaff or Fun Fly Stick
•Microscope Cam & LCD Projector
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Past Methods vs. Updated Methods
Updated Method
•Lettuce Seeds (black, pointy)
•Vegetable Oil (yellow, like amber)
•Van de Graaff or Fun Fly Stick
•Microscope Cam & LCD Projector
RESULT: A moving, interactive image
![Page 10: Build Your Own Electric Field Demonstratorphysicsvideos.tripod.com/e-field-oil.pdfJames Lincoln, MS MEd Tarbut V’ Torah HS Irvine, CA Build Your Own . Abstract Seeds in Mineral Oil”](https://reader033.vdocuments.net/reader033/viewer/2022050519/5fa309fbe79bdf27c17284b9/html5/thumbnails/10.jpg)
Experimental Set up
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Experimental Set up - Detail
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Experimental set up: Home-Made Version
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Experimental Set up – Camera View
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Examples: Capacitor: Field off
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Examples: Capacitor: Field on
VIDEO: http://youtu.be/q3Gb3RsRmfw
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Examples: Monopole
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Examples: Pole & Capacitor Plate
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Examples: Dipole
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Examples: No E-Field in a Conductor
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Making the Home Made Version
Materials
• Van de Graaff and clips
(or Fun Fly Stick)
• Small Grounding Sphere
(optional)
• Brass (looking) Hanger
•Styrofoam cups
•Petri Dish
•White Paper
•Lettuce Seeds
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Constructing Simple Electrodes:
Point Charge
Store bought Home made
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Constructing Simple Electrodes:
Capacitor
Store bought Home made
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Constructing Simple Electrodes:
Round
Store bought Home made
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Experimental set up: Home-Made DIY
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Tips for Successful Demonstrations
1. *How to bend & break a hanger – do it again & again
2. Place white paper underneath the dish – for camera
3. Hold a fluorescent light tube to drain off the charge
4. *An Arc should occur between the electrodes -not wires
5. Don’t put too many seeds, they clump & image poorly.
6. Bend the hanger with pliers, students are happy to help.
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thank you
James Lincoln
James @ Physics Videos .net
thank you
VIDEO:
http://youtu.be/q3Gb3RsRmfw