Printhttp://hyperphysics.phy-astr.gsu.edu/hbase/electric/elefie.html
http://en.wikipedia.org/wiki/Electric_field
http://www.physicsclassroom.com/class/estatics/Lesson-4/Electric-Field-I...
http://www.britannica.com/EBchecked/topic/182554/electric-field
http://physics.bu.edu/~duffy/PY106/Electricfield.html
http://phet.colorado.edu/en/simulation/charges-and-fields
http://www.physics.usyd.edu.au/super/life_sciences/E/E-all.pdf
6th grade
8th grade
11th grade
12th grade
