arXiv:1001.2896v2 [physics.gen-ph] 25 Sep 2010 The paper offers the full action for an electromagnetic field with electrical and magnetic charges; Feynman laws are formulated for the calculation of the interaction cross-sections for electrically and magnetically charged particles on the base of offered action within relativistic quantum field theory. Derived with formulated Feynman rules cross-section of the interaction between an elementary particle with magnetic charge and an elementary particle with electrical charge proves to be equal zero. PACS numbers: 14.80.Hv Keywords: magnetic monopole Full Action for an Electromagnetic Field with Electrical and Magnetic Charges ∗ serov@vniief.ru 1 Abstract S. S. Serova Physics Faculty, St. Petersburg State University, St. Petersburg, Russia S. A. Serov ∗ Russian Federal Nuclear Centre – All-Russian Scientific Research Institute of Experimental Physics, Institute of Theoretical and Mathematical Physics, Sarov, Russia (Dated: February 7, 2018)