I'm attempting a question about the Stern-Gerlach experiment where an electron is used with an assumed up-spin state in a non-uniform magnetic field. It asks us to talk about the dynamics of this electron and what would happen if there was a double slit set up, but it also asks "What if the magnetic field is physical?". Is this just a nonsense question? surely the magnetic is always physical? I want to know if I'm misunderstanding a basic concept or if this is something much deeper.
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