In this case, the electrical and magnetic constants
([[epsilon].sub.0] and [[mu].sub.0]) are expressed as follows:
--magnetic constant [[mu].sup.0], which in SI units is 4[pi] x [10.sup.-7] Henry/metre, is replaced by a new magnetic constant
[[mu].sub.o] = 1/[[epsilon].sub.0][c.sup.2] = 0.0344 [[N.sup.-1]].
where k = [bar.1,3] is the cable number; [[??].sub.k] is the complex current amplitude in the core of the k-th cable; [[??].sub.x], [[??].sub.y] are the orts of the Cartesian coordinate system; ([x.sub.k], [y.sub.k]) are the axes coordinates of the k-th cable; [[mu].sub.0] = 4[pi] x [10.sup.-7] H/m is the magnetic constant
Thus, the quantity inverse to the magnetic constant
, is the centrifugal force which appears due to the rotation of the vortical tube's element whose mass is [m.sub.e], with the velocity of light c around the radius [r.sub.e].
where [[??].sub.z] is the complex amplitude of the component of the vector potential of the electromagnetic field along the Z axis directed parallel to the cable line; j is the imaginary unit; [[mu].sub.0] = 4[pi] x [10.sup.-7] H/m is the magnetic constant
; [omega] = 2[pi] x 50 [s.sup.-1] is the cyclic current frequency; [sigma] is the conductivity of the medium for which the equation is written ([[sigma].sub.Al] = 3.8 x [10.sup.7] S/m, [[sigma].sub.Cu] = 5.0 x [10.sup.7] S/m, [[sigma].sub.air] = 0 S/m).