Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Experimental Evaluation of the Claimed Coulomb Rotation (Electrostatic
  Torque)   In the year 2002 publications of A.V.M. Khachatourian and A.O. Wistrom were
released, in which the existence of an electrostatic torque has been claimed.
This moment of force should act in a three sphere configuration, where one
sphere is held at a constant electric potential. This claim was based on an
observed rotation and was supported by a mathematical solution derived by
Wistrom and Khachatourian. The theoretical work of Wistrom and Khachatourian as
well as the interpretation of the observed rotation were criticized by several
scientists who offered alternative explanations for the rotation. We therefore
designed an experimental setup which enabled us to investigate the phenomenon.
By performing numerous measurements, we showed that the rotation is due to
asymmetric mass distribution within the sphere, which is dislocated due to
electrostatic forces between the spheres. We were able to clear our
measurements from this effect and observed a null result more than two orders
of magnitude smaller than predicted by Khachatourian and Wistrom's theory. We
therefore showed that the rotation doesn't occur in an electrostatic system
within the resolution of our experiment.

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The categories of this paper are: hep-ph
34
The categories of this paper are: chem-ph
2
The categories of this paper are: math
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an