Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental test of the compatibility of the definitions of the
  electromagnetic energy density and the Poynting vector   It is shown that the generally accepted definition of the Poynting vector and
the energy flux vector defined by means of the energy density of the
electromagnetic field (Umov vector) lead to the prediction of the different
results touching electromagnetic energy flux. The experiment shows that within
the framework of the mentioned generally accepted definitions the Poynting
vector adequately describes the electromagnetic energy flux unlike the Umov
vector. Therefore one can conclude that a generally accepted definitions of the
electromagnetic energy density and the Poynting vector, in general, are not
always compatible.

13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an