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Honestly the whole field of electromagnetism just builds upon these 4 fundamental equations. It’s impressive how much is encoded here.pic.twitter.com/scyyWrrG89
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Alongside Lorenz force law, it explains the whole field of classical electromagnetism. Incase anyone is interested, here are Anthony’s note that I used as a student. https://www.damtp.cam.ac.uk/user/examples/D21Lb.pdf … (His notes are a really nice intro to the field).