1-I was wondering If the coil wire cross-section area and A are the same thing in the coil equation (Je=NIcoil/A ) ? Moreover, Why the length and the frequency are not included in this equation by knowing that they are also important factors?
2- How to calculate the Ldomain, Adomain, Fl and FA cofficient in the Lcoil=Fl.Ldomain and Acoil=FA.Adomain equation?
In general A is the area. Length does not enter into the equation, neither does frequency if L is independent of it.
Are you talking about the factors related to symmetry in comsol? If you have symmetry but don't want to calculate explicitly, just enter appropriate values according to your setup.
that is just a long-wave approximation. there is no good universal method describing a coil, but many methods appropriate for particular designs and conditions.
Check theory section here:
https://coil32.net/theory.html
http://www.g3ynh.info/zdocs/magnetics/appendix/self_res/self-res.pdf
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