hi all, i am currently working on a magnet generator/motor and i have some qns on electromagnetism. i am currently trying to find out how much does my electromagnet (ferrite core) requires in order to repel a permenant magnet, in this case, a cylindrical NdFeB magnet. i have been trying to find out from the web and libraries regarding the force between the magnets and the closest i have come to is http://en.wikipedia.org/wiki/Magnet#Force_between_two_magnetic_poles there r so many other equations but none of them involves an electromagnet and a permanent magnet. so i would like to ask for advice and correction. thanks!