In connection with the contactless suspension of objects by electric and magnetic fields, an electrodynamical version of Kapitza's theorem on the stabilizing influence of a rapidly oscillating field is deduced.
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Papas, C.H. On the contactless suspension of objects by electric and magnetic fields. Appl. Phys. 13, 361–364 (1977). https://doi.org/10.1007/BF00882611