Calculating Magnetic Pole Strength: Guide to Theory & Experiment

[Anthony physics]

Ok, I've spent lots of hours browsing the web and the library and still this question is burning. How can i calculate, whether it be experimentally or theoretically, the " pole strength" of a magnet. (I have read about the experiment where you divide the work it takes to turn a magnet around a wire by the induced current however the magnet i am trying to analyse is not a real magnet, it is 2 magnetic fields that interact with each other and create the same magnetic field lines that a permenany magnet would). this being said, the ultimate goal of finding the pole strength is to use it in the Gilbert theory equation (https://wikimedia.org/api/rest_v1/media/math/render/svg/434c7a409f34d449baf45e6143cc19a2a40a3e20) to figure out the force that this magnetic field pulls a piece of iron with. So does anyone have any recomendationon how to figure out this value? what experiment to carry out? Or even a different way of figuring out the attraction force between non uniform magnetic field and metal?
Thanks

 

[Simon Bridge]

That is not easy ... the net force depends on the shape of the field and the shape of the iron.
It gets asked a lot here... have a look through other threads.
ie. https://www.physicsforums.com/threads/magnetic-force-on-iron.354314/