Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetodielectric effect of Graphene-PVA Nanocomposites   Graphene-Polyvinyl alcohol (PVA) nanocomposite films with thickness $120 \mu
m$ were synthesized by solidification of PVA in a solution with dispersed
graphene nanosheets. Electrical conductivity data were explained as arising due
to hopping of carriers between localized states formed at the graphene-PVA
interface. Dielectric permittivity data as a function of frequency indicated
the occurrence of Debye-type relaxation mechanism. The nanocomposites showed a
magnetodielectric effect with the dielectric constant changing by 1.8% as the
magnetic field was increased to 1 Tesla. The effect was explained as arising
due to Maxwell-Wagner polarization as applied to an inhomogeneous
two-dimensional,two-component composite model. This type of nanocomposite may
be suitable for applications involving nanogenerators.

8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
1
The categories of this paper are: cs
35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
30
The categories of this paper are: q-alg
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
5
The categories of this paper are: gr-qc
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th