Its evening, and Im in a friendlier mood.. Its been a long day for me but I left Josh up there in the subject line. If I had not balked at calculus, I might have gotten to like math.. Today i had confirmed some of my disbeliefs, and unconfirmed some of my beliefs. I was unsure that mag fields worked according to inverse square law... Now I know they dont. because inverse sq only works for a point source .. Even light doesn't if it is coming from a flat plane, and electric fields do not if they are coming from a linear conductor.. hmm So I just got a problem that is so complex it needs a High priest of math. In the sense that gravity causes acceleration because it is a constant, how does one calculate the acceleration on a unit pole from a magnetic field that is not constant universally??? No one on google knows.. But experiment shows that the force between magnets increases rapidly with decreasing distance.. My experiment.. I want to shoot a magnet oriented for poles attracting very close to but through and at right angles to a powerful magnetic field. If it is too slow it will get captured.. How do I calculate the escape velocity for a fly past.??? would there be one? I mean, a mag field can accelerate a particle up to the speed of light. I just bet this will cause pages of calculations??? Philip.