Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On Possibility of Coulomb Interaction between Masses and Electrical
  Charges   From non-linear modification of Maxwell-Einstein theory, considered in
(physics/9801031), follows modified Coulomb law for interaction between charged
objects. Namely, if $(m, e)$ and $(m', e')$ are masses and charges of two
objects, then the potential energy of interaction, $V(r) = [ee' - kmm' -
\sqrt{k}(em' + e'm)]/r $, where $k$ is Newtonian constant. It follows, that the
Earth should possess negative electric charge, $Q_E = - \sqrt{k} M_E$. Obtained
result explains, why do primary cosmic rays consist mainly of positive charges.

24
The categories of this paper are: dg-ga
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
14
The categories of this paper are: math-ph
18
The categories of this paper are: econ
35
The categories of this paper are: mtrl-th
19
The categories of this paper are: eess
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
20
The categories of this paper are: acc-phys
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci