Quickfield has a free "student edition": https://quickfield.com/index.htm https://quickfield.com/index.htm I also recall there being at one time a DOS-based m

Quickfield has a free "student edition": https://quickfield.com/index.htm https://quickfield.com/index.htm I also recall there being at one time a DOS-based magnetic field simulation software, but I can't recall the name of it. Probably could find it (or at least the shareware version) in a simtel archive somewhere. If you really want a better answer for this, look into browsing and asking around one of the various "magnetic overunity" perpetual motion/energy sites out there. Tons of people out there using such software trying to crack the laws of thermodynamics and extract "free energy" from magnets - here's a start down that wormhole: http://jnaudin.free.fr/ http://jnaudin.free.fr/