Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Relatively Moving Systems in "True Transformations Relativity"   In this paper the physical systems consisting of relatively moving subsystems
are considered in the "true transformations relativity." It is found in a
manifestly covariant way that there is a second-order electric field outside
stationary current-carrying conductor. It is also found that there are opposite
charges on opposite sides of a square loop with current and these charges are
invariant charges.

33
The categories of this paper are: plasm-ph
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
22
The categories of this paper are: chao-dyn
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph