You can feel a magnet pulling on metal through empty space, but what actually creates that invisible force? The answer isn't what you'd expect. Magnetism isn't a substance hiding inside a magnet. It's not a fluid, a gas, or a mysterious invisible material. According to quantum physics, magnetism emerges from something far deeper: the intrinsic quantum spin of electrons, the motion of electric charges, and the strange quantum rules that govern how particles interact inside matter.
In this video, we trace the full story, from the ancient Greeks discovering lodestones to Oersted's accidental compass experiment, from Faraday and Maxwell unifying electricity and magnetism into one force, to the quantum revolution that revealed electron spin, the Pauli exclusion principle, and the exchange interaction. You'll learn why most materials aren't magnetic, how magnetic domains work inside iron, why neutrons have magnetic moments despite having no charge, and how Einstein's relativity reveals that magnetism is what electricity looks like from a moving frame of reference.
Sources:
Griffiths, D.J. (2017). Introduction to Electrodynamics (4th Edition). Cambridge University Press.
Feynman, R.P., Leighton, R.B. & Sands, M. (2011). The Feynman Lectures on Physics, Volume II: Electromagnetism (New Millennium Edition). Basic Books.
Blundell, S. (2001). Magnetism in Condensed Matter. Oxford University Press.
Oersted, H.C. (1820). "Experiments on the Effect of a Current of Electricity on the Magnetic Needle." Annals of Philosophy, 16, 273–276.
Hanneke, D., Fogwell, S. & Gabrielse, G. (2008). "New Measurement of the Electron Magnetic Moment and the Fine Structure Constant." Physical Review Letters, 100(12), 120801.
https://doi.org/10.1103/PhysRevLett.100.120801
#QuantumPhysics #Magnetism #Electromagnetism #ElectronSpin #QuantumMechanics #Physics #Science 
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