Force due to Magnets

Hi, I was wondering if anyone could point me in the right direction or give me topics/keywords to search for in finding out how to calculate a force due to magnets (let's say an 80 lb magnet) that is moving in a circular path. Eventually I am going to need to know how to calculate the 3D stress on a small circular disc at an arbitrary point within this circular path due to the magnets. I know this isn't much to go on, but I'm just looking for generic help right now as I'm not sure of all the details yet.

Thanks!!

Hi and welcome to the forum...
Type magnetic field... magnetic field equation... magnetic forces...
Things like that... :)

Good luck,
Bob

See:

[URL="http://www.engineersedge.com/calculators/magnetic_lifting_force_equation_and_calculator_13042.htm"]Magnetic Lifting Force Equation and Calculator[/URL]