Force between 2cyl
For two cylindrical magnets with radius and height , with their magnetic dipole aligned, the force can be well approximated (even at distances of the order of ) by,
where is the magnetization of the magnets and is the distance between them. In disagreement to the statement in the previous section, a measurement of the magnetic flux density very close to the magnet is related to by the formula
The effective magnetic dipole can be written as
Where is the volume of the magnet. For a cylinder, this is .
When , the point dipole approximation is obtained,
which matches the expression of the force between two magnetic dipoles.