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A high-frequency test of Coulomb's law is described. The sensitivity of the experiment is given in terms of a finite photon rest mass using the Proca equations. The null result of our measurement expressed in the form of the photon rest mass squared is ^2= (1. 041. 2) 10^-19 cm^-2. Expressed as a deviation from Coulomb's law of the form 1{r^2+q}, our experiment gives q= (2. 73. 1) 10^-16. This result extends the validity of Coulomb's law by two orders of magnitude.
Williams et al. (Mon,) studied this question.