Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Exact dipolar moments of a localized electric current distribution   The multipolar decomposition of current distributions is used in many
branches of physics. Here, we obtain new exact expressions for the dipolar
moments of a localized electric current distribution. The typical integrals for
the dipole moments of electromagnetically small sources are recovered as the
lowest order terms of the new expressions in a series expansion with respect to
the size of the source. All the higher order terms can be easily obtained. We
also provide exact and approximated expressions for dipoles that radiate a
definite polarization handedness (helicity). Formally, the new exact
expressions are only marginally more complex than their lowest order
approximations.

27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
2
The categories of this paper are: math
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
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The categories of this paper are: cmp-lg
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex