ArkyBeagle t1_jdxq6fx wrote
Reply to comment by Coldfriction in ELI5: Why are the Electric field and magnetic field always perpendicular to each other? by No_Victory_1611
> The true answer is that they aren't two different things but two expressions of one thing: electromagnetism.
Whether we call it electricity or magnetism is almost an artifact of how we measure it. Although the needle on an old-school analog voltmeter is a magnetic device...
I always liked the cover to Richard Lyon's "Understanding Digital Signal Processing". It's not specifically about E&M but the picture just lights the idea up for me:
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