The law of gravitation has been tested at distances of less than 1 cm using a dynamic field method. For an additional Yukawa term with a range of λ=7.1 mm, a relative coupling constant to the Newtonian potential, α=(0.1±1.1)×${10}^{\mathrm{-}2}$, was obtained.

• Received 24 October 1986

DOI:https://doi.org/10.1103/PhysRevD.36.2321