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Numerical simulation of electric fields within the experimental test setup. (a) The electric field distribution simulated with COMSOL Multiphysics®, v5.3a at the bottom of the Petri dish and (b) at 1 mm above the bottom for a potential difference of 1 V. At an amplitude of 141.4 mV, the result has to be scaled by a factor of 0.1414, yielding e.g., a maximum field of about 5.7 µV/m instead of 40 µV/m at 1 V amplitude.
