Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Charged Radial Infall for Spherical Central Bodies   A massive, charged, spherical central body can be neutralized by attracting
particles of opposite charge. We calculate the time it takes to neutralize
these central bodies using classical mechanics, special relativistic mechanics,
and finally, the "forced" trajectories of general relativity. While we can
compare the classical and (special) relativistic times, and find, predictably,
that the special relativistic neutralization time is longer, a comparison of
these times with the general relativistic result is not as directly possible.
We offer the final calculation as a demonstration of dynamics in a general
setting and in particular, the structural similarity of the (general)
relativistic problem to the other cases.

6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
21
The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
24
The categories of this paper are: dg-ga
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
13
The categories of this paper are: quant-ph
37
The categories of this paper are: supr-con
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
22
The categories of this paper are: chao-dyn