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We tested the gravitational $1/r^2$ law using a stationary torsion-balancedetector and a rotating attractor containing test bodies with both 18-fold and120-fold azimuthal symmetries that simultaneously tests the $1/r^2$ law at twodifferent 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 toranges $< 38.6~\mu$m.

New Test of the Gravitational $1/r^2$ Law at Separations down to 52 $\mu$m