One of them is B = Magnetic Field. Units are Tesla (the engineer-researcher, not the car, obviously), of flux density. It says B = mu H, and that mu is the absolute permeability, and H is the "magnetising force" in ampere-turns/meter.
I'm not sure how this relates to force. Also, it says there are various physical properties that happen when magnets are actually used. - their flux density can saturate - the field can induce current? I dunno!
