Electrostatics Java Simulation links
http://webphysics.davidson.edu/physletprob/ch9_problems/ch9_1_electrostatics/default.html
Physlets
http://webphysics.davidson.edu/Applets/efield4/prb1.html Force vector with 1
unknown charge.
http://webphysics.davidson.edu/Applets/efield4/Forces.html Force vectors
with 5 unknown charges.
http://webphysics.davidson.edu/Applets/efield4/field_potentials.html Electric Fields, field lines, and equipotentials.
http://webphysics.davidson.edu/Applets/efield4/Potential.html 3 different
potential fields. Rank A,B,C
http://webphysics.davidson.edu/Applets/efield4/intro.html EField simulator