PHYS102: Introduction to Electromagnetism

Why couldn't we have made the definitions for electric and magnetic field lines more similar? The answer is that, with magnets you cannot separate positive and negative charges to make a test object that is purely positive. The closest things to "charges" we have in magnetism are the poles of a bar magnet, which are usually called "north" and "south" instead of "positive" and "negative". But, as this video points out, you cannot separate the north and south poles of a magnet from each other.