Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Comment on ``Torque or no torque? Simple charged particle motion
  observed in different inertial frames,'' by J. D. Jackson [Am. J. Phys. 72
  (12), 1484-1487 (2004)]   In this paper it is shown that the real cause of the apparent electrodynamic
paradox discussed by Jackson [J. D. Jackson, Am. J. Phys. 72, 1484 (2004)] is
the use of three-dimensional (3D) quantities E, B, F, L, N, .. . When 4D
geometric quantities are used then there is no paradox and the principle of
relativity is naturally satisfied.

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The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
27
The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: quant-ph
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The categories of this paper are: solv-int
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The categories of this paper are: math-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an