Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The role of current loop in harmonic generation from magnetic
  metamaterials in two polarizations   In this paper, we investigate the role of the current loop in the generation
of second and third harmonic signals from magnetic metamaterials. We will show
that the fact that the current loop in the magnetic resonance acts as a source
for nonlinear effects and it consists of two orthogonal parts, leads to the
generation of two harmonic signals in two orthogonal polarizations.

20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga