Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Casimir electromotive force in periodic configurations   The possibility in principle of the existence of Casimir electromotive force
(EMF) is shown for nonparallel nanosized metal plates arranged in the form of a
periodic structure. It is found that EMF does not appear in strictly periodic
structures with parallel plates. However, when the strict periodicity is
disturbed in nonparallel plates, EMF is generated, and its value is equal to
the number of pairs of plates in a configuration. Moreover, there are some
effective parameters of the configuration (angles between plates, plate lengths
and length to length ratios), at which the EMF generation per unit of the
length of the periodic structure is maximal.

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The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
26
The categories of this paper are: bayes-an
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin
22
The categories of this paper are: chao-dyn
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th