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I tried to approximate the attraction between them by using the equation for attraction between cylinderical bar magnets:

F=\left[\frac {B_0^2 A^2 \left( L^2+R^2 \right)} {\pi\mu_0L^2}\right] \left[{\frac 1 {x^2}} + {\frac 1 {(x+2L)^2}} - {\frac 2 {(x+L)^2}} \right]

where

B0 is the magnetic flux density very close to each pole, in T,

A is the area of each pole, in m2,

L is the length of each magnet, in m,

R is the radius of each magnet, in m, and

x is the separation between the two magnets, in m

(its from http://en.wikipedia.org/wiki/Force_between_magnets)

I have been told this is not an appropriate equation. Can anyone help me understand why, and what I should do instead?

Any advice much appreciated.

LB