Friday, February 16, 2018

How Special Relativity Makes Magnets Work


Length contraction is a fundamental consequence of the fact that we live in a 4 dimensional world in which objects are worldtubes in spacetime that are cut at different angles by the "now slices" of relative observers. Depending on the angle of the slice across the worldtube, it will either be longer or shorter. That means that objects that are moving relative to you will literally be contracted in the direction they're moving in. Now technically, this contraction doesn't come from the objects being "squished" in the sense of being compressed, like what you do with an accordion or a slinky. That would require an additional force and is a misunderstanding of length contraction.

If you've ever wanted a clear example of experimental proof of length contraction you may not have considered, watch this video from the highly popular YouTube channel Veritasium that shows how electric magnets are due to length contraction.


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