One unit of electric flux (symbol Ψ) emanates from unit charge; that is, Ψ (pronounced ‘psi’) units of flux emanate from Q coulombs. Hence
Practical units of electric flux are microcoulombs (1 μC = 10−6 C) and picocoulombs (1 pC = 10−12 C).
$$\Psi = QC$$
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© Noel M. Morris 1977