Abstract
It is shown that in the relative motion of the normal and superfluid components of He II with velocity w, an electric potential difference arises. The causes of this phenomenon are electrical properties of quantum vortex rings (QVR) and the anisotropic QVR energy dependence on its momentum due to w. Explicit analytical expressions for the potentials arising from the second sound wave in an external electric field are derived. The comparison of calculated values with observed ones is made, and new experiments are proposed.
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