Physics
Video Tuesday April 19, 2016
Visualizing
the Electric Field by James Lincoln
For
as long as I have been a Physics Teacher, I have been interested in making the
Electric Field visible to my students.
This is IMPOSSIBLE because it is literally imaginary. Despite this challenge, I have researched and
demonstrated the best ways to display it.
What follows is a collection of videos I have created to demonstrate and
describe the Electric Field.
Perhaps
the best way to demonstrate it is with Potassium Permanganate crystals which
dissolve slowly on a damp saline cloth.
ELECTRIC
FIELD Visualized with Crystals
For
AAPT Films, I created a two-part documentary on all of the best ways I know to
demonstrate the electric field:
Ten
Ways to SEE the Electric Field - Part 1
Ten
Ways to SEE the Electric Field - Part 2
It
is not enough that we simply show the effects of the electric field, but we
must also know the rules of how it behaves.
Here are two videos I made for UCLA Physics on the Rules of Drawing
Electric Field Lines and Rules regarding the behavior of Conductors:
5
Rules of the Electric Field
5
Rules for Conductors
In
my research, I did create an original contribution to these demonstrations that
I think makes a classic work much better.
In this video, I have some more of my lettuce seed demonstrations. I have written an article about making this
yourself from a coat hanger and Styrofoam cups:
Lettuce
Seed Demonstrations
This demonstration is typically performed using grass seeds:
Grass Seeds Electric Field Demos
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