Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Dynamics of a magnetic monopole in matter, Maxwell equations in dyonic
  matter and detection of electric dipole moments   For a monopole, the analogue of the Lorentz equation in matter is shown to be
f = g (H - v cross D). Dual-symmetric Maxwell equations, for matter containing
hidden magnetic charges in addition to electric ones, are given. They apply as
well to ordinary matter if the particles possess T-violating electric dipole
moments. Two schemes of experiments for the detection of such moments in
macroscopic pieces of matter are proposed.

15
The categories of this paper are: nucl-ex
4
The categories of this paper are: cond-mat
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
21
The categories of this paper are: adap-org
18
The categories of this paper are: econ
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
34
The categories of this paper are: chem-ph