Seeing some confusing answers here. I’m hoping I can tidy them up.
The short answer is that we observed a moving charge before we could observe a moving particle. WAY before. We had just loads of experiments and observations and formulae and then we saw it! We saw the moving electrons… and … they’re moving… the OTHER way. Oh, boy.
Now science has a choice. We can either pretend it never happened and change what we write down the opposite thing from now on and put an asterisk on everything we’ve ever seen.
Or.
We can (and typically do in science) respect the past as totally legitimate observation and separate the charge from the particle that causes it.
I could describe the movement but I think it is better to point to another thing this happened with, magnets. The Earth’s North pole (like where Santa lives) is a magnetic south pole and Antarctica is magnetic North. We called the north pole of a magnet the north pole because it points north. But like poles repel. Again, we’ve got a lot invested already, so we just note that one thing rather than changing all of everybody’s notes.
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