How Do I Calculate Magnetic Force Against Distance?

I'm trying to work out the attraction between two magnets at varying distances apart. I know that it takes 750g of weight to break them apart when touching, but I cannot find a formula to predict how much is required if they are 1mm apart, 2mm apart etc.

I have found some articles which say that magnetic force obeys the inverse square law, but this can't be used when I don't know where the poles are within the magnets. If I assume the poles are in the faces of the two magnets, then the inverse square law predicts a magnetic force of infinity if the two poles are touching!

Can anyone help?
16:36 Wed 13th Jun 2007
 
Best Answer


No best answer has yet been selected by brassmonkey. Once a best answer has been selected, it will be shown here.

For more on marking an answer as the "Best Answer", please visit our FAQ.

1 to 3 of 3

The most obvious and simple way to simplify the problem is to assume the poles are in the middle of each magnet.
I suppose you tried it already? How did it go?
do it old skool - Do a quick experiment, bung the results into excel (proper old skool I know!) or use a pen, then interpolate / extrapolate to your hearts content!

1 to 3 of 3

Latest posts