Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New Test of the Gravitational $1/r^2$ Law at Separations down to 52
  $\mu$m   We tested the gravitational $1/r^2$ law using a stationary torsion-balance
detector and a rotating attractor containing test bodies with both 18-fold and
120-fold azimuthal symmetries that simultaneously tests the $1/r^2$ law at two
different length scales. We took data at detector-attractor separations between
$52~\mu$m and 3.0 mm. Newtonian gravity gave an excellent fit to our data,
limiting with 95\% confidence any gravitational-strength Yukawa interactions to
ranges $< 38.6~\mu$m.

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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: hep-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: plasm-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: adap-org
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The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-th
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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: quant-ph