Two Energy States The magnetic fields of the spinning nuclei will align either with B state the external field,or against the field. Bo hv=△E A photon with the right amount of energy can be absorbed o state and cause the spinning proton to flip. => Chapter 13 5 Chapter 13 5 Two Energy States The magnetic fields of the spinning nuclei will align either with the external field, or against the field. A photon with the right amount of energy can be absorbed and cause the spinning proton to flip. =>