An electron in an external magnetic field Bext has its spin angular momentum Sz antiparallel to Bext. If the electron undergoes a spin-flip so that Sz is then parallel with Bext, must energy be supplied to or lost by the electron?
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An electron in an external magnetic field Bext has its spin angular momentum Sz antiparallel to Bext. If the electron undergoes a spin-flip so that Sz is then parallel with Bext, must energy be supplied to or lost by the electron?