Electricity and Magnetism > Electric Fields DCS# 5B10.40
ELECTRIC FIELD MAPPING
screen shot from fieldmap.com
APPARATUS
laptop 202
video projector 201
DESCRIPTION
Run program "field.com".  Use arrow keys to move cursor and position charge.  Enter an integer between 9 and -9 for value of charge.  Repeat for up to 10 point charges.  Press "e" to plot field lines, any other key to exit.

 NOTES

Here are some electric field mapping java applets that show both field lines and equipotentials:  www.gel.ulaval.ca/~mbusque/elec/main_e.html
http://www.cco.caltech.edu/~phys1/java/phys1/EField/EField.html
http://www.falstad.com/emstatic/