Torr and Li claim to have shown that experimentally detectable gravitomagnetic and gravitoelectric fields can be generated in a superconductor. We review their calculations and show that because of unrealistic assumptions the fields that they calculate are too large by many orders of magnitude.
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Harris, E.G. Comments on “Gravitoelectric-Electric Coupling via Superconductivity“ by Douglas G. Torr and Ning Li. Found Phys Lett 12, 201–208 (1999). https://doi.org/10.1023/A:1021621425670