Electric Field modeling
- This simulation from falstad.com displays several common electrostatic field configurations
http://www.falstad.com/vector2de/
- This simulator by John Welch, still in development, lets you view and measure electric fields around various electrode configurations.
https://johnw.org/physicsapps/fieldmapping.html
This set of three simulations from PhET can also be used to discuss electric fields.
This one introduces the topic and shows fields of basic configurations
- Charges and Fields
https://phet.colorado.edu/en/simulation/charges-and-fields
While these two are designed as interactive activities for students.
- Electric Field of Dreams
https://phet.colorado.edu/en/simulation/legacy/efield
Electric Field Hockey
https://phet.colorado.edu/en/simulation/legacy/electric-hockey
- B. Surdendranath offers this simulation that shows the field lines and equipotentials around one or two charges, with variable charge ratio
https://www.surendranath.org/GPA/Electricity/ElectricField/FieldLines.html
- and this additional one that calculates the field vectors of a ring of charge
https://www.surendranath.org/GPA/Electricity/EFAR/EFAR.html
- Tom Walsh at oPhysics offers this simulation that shows the electric field or potential around several popular charge configurations. A simulated sensor probe can be placed to measure potential or field strength at any point.