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The inverse-square distance dependence of the gravitational force has been tested over a range of approximately 2 to 5 cm, by use of a test mass suspended from a torsion balance to probe the gravitational field inside a mass tube. The result supports an inverse-square law. Assuming a force deviating from inverse square by a factor [1+ε lnγ (cm)] it is found that ε=(1±7)×10^-5.
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Spero et al. (1980) studied this question.
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