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Wikispaghetti (talk) 19:44, 5 May 2011 (UTC) The French Wiki says that Du Nouÿ is the correct spelling, saying it's often misspellt (http://fr.wikipedia.org/wiki/Pierre_Lecomte_du_Nouÿ#cite_note-0).
Strider98107 (talk) 15:31, 23 July 2019 (UTC)Hmmm... I don't think Equation 1 is needed. If radius to center of ring is R, and ring wire radius is r, then inner ring radius is 2(pi)(R-r), outer ring radius is 2(pi)(R+r), the total force is F=(gamma)[(2)(pi)(R+r)+(2)(pi)(R-r)] = (gamma)(4)(pi)(R)
This is independent of the wire diameter. The correction factor f is still needed, of course.