by means of a separate cut of a constant current.
The authors of all these statements (what is a reason?) do not want to apply principle of complete indemnification which is used in different methods of researches and follows from a principle of a superposition.
J.A. Stratton. The THEORY of an ELECTROMAGNETISM. State publishing house of the technical and theoretical literature. Moscow. 1948.
Page 210 " It is difficult to imagine experience, which would allow to spot an addend from a separate element " [In the closed electric circuit of a direct current].
S.E. Frish, A.V. Timoreva. The course of physics, volume 2. THE ELECTRICAL And ELECTROMAGNETIC PHENOMENA. Publishing house of the Leningrad state university. Leningrad. 1949.
page 246 " On experience we can not carry out a separate cut of a current, so it is impossible to measure, what field is created by what current element " [In the closed electric circuit of a direct current].
S.G. Kalashnikov. A BLANKET COURSE of PHYSICS. Volume 2. AN ELECTRICITY. State publishing house by technique and theoretical literature. Moscow. 1956.
page 176 "...on experience it is possible to explore only interaction of closed contours and it is impossible to carry out separate current elements " [In the closed electric circuit of a direct current].
I.E. Tamm. Fundamentals of the theory of an electricity. Moscou. Science. Main edition of the physical and mathematical literature. 1989.
page 163 "...The question about a field created by a separate current element, can not be decided unequivocally, for it is impossible to isolate a separate part of a direct current which circuit must be closed ".
