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The uncertainty relation tells us that an electron that is localised (in terms of its PDF) is space has a large uncertainty in momentum space. However in classical electrostatics/dynamics we seem to make attempts to do things like approximating the magnetic field caused by an electron moving at a given velocity from A to B.

Isn't this a little wonky since we are assuming that we know position and momentum at the same time? If so, is there a reason why classical theory still holds up pretty well (slight understatement)?

Thanks in advance!