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I'm studying the interaction of one electron atom with an electromagnetic field. In every textbook the starting point is the hamiltonian of the system containing the scalar potential and the vector potential. But then the scalar potential is ignored and I don't understand why.

I've read that in the coulomb gauge I can choose the scalar potential to be 0, why??

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# Homework Help: Coulomb gauge and scalar potential

**Physics Forums | Science Articles, Homework Help, Discussion**