I suppose it is because the things we use to visualize the magnetic field interact with it, and then each other, to clump together like iron filings on a piece of paper–but what about the aurora borealis/australis? So are the lines of force an artifact of visualization?
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The lines of force are an artefact of visualization, but are important to understand because a given section of a field will have an orientation, which is what those lines are depicting, and that orientation determines how it affects other things within that field.
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