this post was submitted on 02 Feb 2026
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Magnets.
If there's no field there's 0, if there's a magnetic field clockwise it makes a positive charge, if there's a magnetic field rotating counterclockwise it makes a negative charge,
Likewise if there's a positive charge it makes a clockwise magnetic field and if there's a negative charge it makes a counter clockwise field. (I may be backwards +/- clockwise/counter clockwise, something about the thumb on my left hand..., but really it's all arbitrarily named, but the reason you just say negative or positive is that those are scalable measures, you can't have half a Bob or 2 Alice. )