where l, [dl.sub.M] are the contour of the meridian section and its element with the center in the point M; Q, U [member of] l are the observation point and the point with current coordinated; [[sigma].sub.m](U) is the surface density of fictitious magnetic charges; [[micro].sub.0] is the magnetic constant
; K(k) is the complete elliptic integral of the first kind of module k ;
where the electric constant becomes linear density of the vortical tube, and the reciprocal of the magnetic constant
is the centrifugal force produced by rotation of the vortical tube element with [m.sub.e] mass with the velocity of light c along [r.sub.e] radius.
where [??][V/m] is the electric field and [??][T] is the magnetic induction field (linked to the magnetic field [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] where [mu] = [[mu].sub.r][[mu].sub.0]; [[mu].sub.0] = 4[pi] x [10.sup.-7] [H/m] is the vacuum magnetic constant
and [[mu].sub.4] is the relative permeability).
where B is the magnetic flux density vector; A is the vector magnetic potential; [nabla]V is scalar electric potential difference; [[mu].sub.x] is relative permeability; [[mu].sub.0] = 4[pi] x [10.sup.-7]H/m is magnetic constant
; sr is relative permittivity; [[epsilon].sub.0]=8,85 x [10.sup.-12] F/m is electric constant.
where H is the magnetic field strength vector in the calculated area free of electric currents; [[mu].sub.0] is the magnetic constant
; [chi] is the average magnetic susceptibility of the removed body which depends on its shape, the ratio of the size and the magnetic permeability of the substance.