## Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

## magnetic force

Classically, the force between two magnetic poles is given by:[28]

$F={{mu q_{m1} q_{m2}}over{4pi r^2}}$

where

F is force (SI unit: newton)
qm1 and qm2 are the magnitudes of magnetic poles (SI unit: ampere-meter)
μ is the permeability of the intervening medium (SI unit: tesla meter per ampere, henry per meter or newton per ampere squared)
r is the separation (SI unit: meter).

The pole description is useful to the engineers designing real-world magnets, but real magnets have a pole distribution more complex than a single north and south. Therefore, implementation of the pole idea is not simple. In some cases, one of the more complex formulae given below will be more useful.

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