Abstract
Ghosh and Hirsch [Phys. Rev. B 86, 054511 (2012)] claimed that many micrometer-size particles in liquid nitrogen, as large as 25 to 32 \ensuremath{\mu}m, could be aggregated into balls by shaking. Ghosh and Hirsch performed their experiments with liquid nitrogen in open air; therefore, moisture condensed on the particle surface, leading to ball aggregation by shaking. This phenomenon has nothing to do with the electric field-induced formation of superconducting balls. In addition, their claim that a large electric field still exists in the interior of the capacitor when the electrodes are insulated is flawed. The electric field--induced superconducting ball formation reveals that the area of interaction between electric field and superconductors requires more investigation. However, the phenomenon can be explained within the BCS theory.
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