outer electric potential, \(\psi\)
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https://doi.org/10.1351/goldbook.O04349
electric potential outside the phase concerned. For a conducting sphere of excess charge Q and radius r in vacuum ψ = Q 4 π ɛ 0 r.
Source:
Green Book, 2
nd
ed., p. 59 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)