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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!