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(This section needs also an expression for the expectation value of 1/r^3 that is valid for the l=0 states.) — Preceding unsigned comment added by 71.198.216.68 ( talk) 17:36, 21 February 2013 (UTC) reply

Hi @ Mominert I saw that you added a subsection about the calculation as seen from the nucleus. The problem of this calculation is that it is tricky due to considerations of hidden momentum and Mansuripur's paradox. If you have not anything against it I will remove the header of the section and just leave the line saying that a similar calculation can be done on that frame. ReyHahn ( talk) 10:17, 14 May 2023 (UTC) reply

Hello. You could edit as you suggested, I'm not an expert! I didn't know this paradox yet I understand the base problem of the "wrong torque" (fig 1 of the article) of the paradox. Perhaps the problem is less problematic here because in the classic picture when the electron moves on a cicular orbit in the x-y plane and with a magnetic dipole moment along the z-axis, the electric diplole moment in the rest frame of the nucleus is parallel to radius vector (nucleus–electron) and hence this "wrong torque" is zero.-- Mominert ( talk) 19:49, 14 May 2023 (UTC) reply