# Homework Help: Attraction and Repulsion Forces Between Magnets

1. Jun 20, 2007

### eek3386

How do you calculate the attraction and repulsion forces between two magnets? I know it depends on many factors, so for example: two 0.5"x0.5"x0.25" Neodynium magnets with a grade of 42 (Br = 13200 Gauss) that are 0.25" apart from each other (only air is separating them).

Thanks for any help in advance!

edit: **This is not a homework problem. After much research, I have been unable to find a way to calculate the forces between two magnets. It seems a lot of the science behind it is vague as of now. I have found one website that calculates these forces, but they don't list equations that are used. I tried to contact the company, but they haven't responded to me. I was wondering if anyone else had more insight into this.**

Last edited: Jun 21, 2007
2. Jun 20, 2007

### Mindscrape

Is this a homework problem? If so you need to tell us some of your thoughts before we can help out. If not, perhaps you could repost in the general physics section (since you are free to get answers to hypothetical problems and questions there).

Superposition might be a good start.

3. Jun 21, 2007

### eek3386

It's not a homework problem. I reposted it in the general physics forum with some additional info.

4. Jun 21, 2007

### eek3386

In regards to superposition, I haven't found a good equation for the force from a magnet at a distance. I've found one for the force from a magnet on steel at a distance. However, the magnets I'm trying to use are not composed of steel.

5. Jun 22, 2007

### eek3386

Anyone able to help?