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I am trying to understand how NMR works, but I am not sure why a spinning nucleon produces a magnetic field. Is this a consequence of the quark structure inside?

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    $\begingroup$ The quarks inside the nucleons have spin and orbital angular momentum, both of which combine into a nuclear spin. Since quarks are structureless (as far as we know) the link between magnetic field and spin is the same as with the spin/orbital angular momentum of electrons in magnetic atoms: it's an intrinsic feature of quantum field theory. One can't separate magnetism from microscopic spin-every macroscopic magnet is the result of many of these microscopic particle spins. If you want to "feel" quantum electrodynamics at work: take two really strong magnets into your hand! $\endgroup$ – CuriousOne Jan 6 '15 at 12:39
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It's certainly true that a classical charged object that spins generates a magnetic field; the moving charges form current loops. If you're trying to understand NMR this is probably a good-enough model for the nucleon magnetic moments.

Quantum-mechanical spin is a different creature, though, and thinking about it classically can get you only so far.

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