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As far as I am concerned, 1. is now sufficient to me.DrDu said:I also think that the original question has been clarified:
1. For a constant macroscopic current - whether superconducting or not - we expect practically no radiation due to the homogeneity of the charge and current distributions.
2. Radiation in superconductors is supressed further by a similar mechanism as scattering, i.e.
a Cooper pair can't make an energetically favourable radiative transition to a condensate with lower velocity as this condensate is not present.