Why is there no kinetic energy term in said hamiltonian? Suppose I take a magnetic dipole in my hand, and I throw it in the field. Then surely its classical energy is E = p²/2m - [itex]\vec{\mu} \cdot \vec{B}[/itex].(adsbygoogle = window.adsbygoogle || []).push({});

Then why is the p²/2m term absent in the hamiltonian?

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# Hamiltonian of a spin 1/2 particle in a constant mag. field

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