LECTURE 8: FIELD LINES
1) Place an arbitrary number of charges and see field lines, equipotential lines, etc..
http://www.cco.caltech.edu/~phys1/java/phys1/EField/EField.html
2) Place an arbitrary number of charges and see field lines, equipotential lines, etc..
http://www.slcc.edu/schools/hum_sci/physics/tutor/2220/e_fields/java/