• Micromot@piefed.social
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      8 天前

      They are from a YouTube video by styropyro where he uses a lot of car batteries on copper tubes and uses compasses to.show the magnetic field, some of them showed the opposite of what they should’ve

      • yetAnotherUser
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        7 天前

        Explanation for those who don’t want to watch the video:

        Spoiler for those that still plan to

        The magnetic field generated by the batteries was so insanely strong, many non-aligned compass needles were, instead of being turned around, permanently re-polarized to conform to the now present magnetic field.

        tl;dr: Exposing compasses to fusion reactor level strong magnetic fields will break (some of) them.