in [11] and [12]; in particular  coordinate indices of four-dimensional vectors and tensors are denoted by latin letters and have values from 0 to 3; a metrics is considered to be defined with diagonal metric tensor: g ik = 0 at i = k   g 00 = 1  g 11 = g 22 = g 33 = − 1; the same upper and lower coordinate indices of four-dimensional tensors always imply summation; if some indices are not coordinate tensor indices  the summation symbol is explicitly shown  if necessary; the four-dimensional coordinate is x i = ( ct  r )  x$_{i}$ = ( ct  − r )  x $^{i}$x$_{i}$ = c $^{2}$t2 − r $^{2}$  where c is the light speed constant  t is time  r is three-dimensional radius-vector. It would appear reasonable that the properties of magnetic charges and the electromag- netic field generated by them would be similar to the properties of electrical charges and the electromagnetic field generated by them: in particular  the force lines of the magnetic field  generated by magnetic charges  start from/end in the magnetic charges  while the force lines of the electrical field generated by currents of magnetic charges are closed  i.e. the existence of magnetic charges  in a sense  restores symmetry between the magnetic and electrical fields. Apparently  the equations describing the electromagnetic field generated by magnetic charges (currents) should be similar to the equations describing the electro- magnetic field generated by electrical charges (currents). At the same time  in view of the topological difference between the electromagnetic field generated by magnetic charges and the one generated by electrical charges they should be described separately in equations. The electromagnetic field  generated by the current density of electrical charges { e$_{a}$ } – j$_{e}$  – can be described using the antisymmetric four-dimensional tensor of the second rank F$_{A}$$_{e}$   which can be represented via the four-dimensional vector potential  A i e def = ( ϕ$_{e}$  A$_{e}$ ) in the following form: The relation between components of tensor F$_{A}$$_{e}$ and components of (three-dimensional) vectors of electrical field E and magnetic field H is described as 3 F ik A$_{e}$ def = ∂A k e ∂x$_{i}$ − ∂A i e ∂x$_{k}$ = ∂ $^{i}$Ak e − ∂ $^{k}$Ai$_{e}$. (1) E α e = − F 0 α A$_{e}$ ( α = 1   2   3) ; H 1 e = − F 23 $_{A$_{e}$}$  H 2 e = − F 31 $_{A$_{e}$}$  H 3 e = − F 12 A$_{e}$ (2) II. MAGNETIC MONOPOLE IN CLASSIC FIELD THEORY