Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on "Radial dependence of radiation from a bounded source" by
  Kirk T. McDonald   The purpose of this note is to point out that McDonald's criticism of our
work \cite{r1} is based on a circular argument. In order to show that the field
of a bounded source falls off as $f(\theta,\phi)/r$ in the far zone, McDonald
uses a Huygens-Kirchhoff diffraction integral whose derivation (from Maxwell's
equations) already entails assuming a fall-off of this form for the field at
infinity \cite{r2}. ($r$, $\theta$ and $\phi$ are the spherical polar
coordinates centred on a point within the source, and $f$ is a factor
independent of $r$.

1
The categories of this paper are: cs
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
21
The categories of this paper are: adap-org