Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New type of fields in Maxwells equations: their properties and method of
  detection   A theoretical analysis of the excitation of an infinitely long solenoid by
oscillating current has revealed the existence of specific potentials in the
space outside the solenoid, which can affect electron diffraction in an
experiment similar to the Aharonov-Bohm effect. Thus, these time-dependent
potentials are physical fields possessing a number of specific features, which
set them off from the fields known heretofore.

18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
5
The categories of this paper are: gr-qc
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
6
The categories of this paper are: astro-ph
21
The categories of this paper are: adap-org
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
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex