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A simple question, in classical mechanics for example you have:

-Because of the speed --> Kinetic energy =1/2 m v^2

-Because of position in a gravitational field ---> Potential energy

In quantum mechanics, let's talk about an electron on an hydrogen atom. From the point of view of the energy on an excited state, the electron will have kinetic energy because of the movement, potential energy because of the proton, but WHat is the mathematical expression for the energy due to the intrinsic spin?

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