+ j(em)ν(x)/c A(em)ν(x) = + Σi=e,p,P,E qi∙ji(n)ν(x)∙A(em)ν(x)/c (55)
- j(g)ν(x)/c A(g)ν(x) = - Σi=e,p,P,E gi∙ji(n)ν(x)∙A(g)ν(x) /c (56)