Quantum redactiones paginae "Tensio electrica" differant
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::<math>V(\vec \mathbf x, t) = \int \frac {\rho^'(t^')}{|\vec \mathbf x -\vec \mathbf x^'(t^')|} dV^'</math>
ubi <math>t^'=t-\frac{|\vec \mathbf x -\vec \mathbf x^'|}{c} </math> est tempus retardadum, ''t'' tempus actuale, ''c'' lucis celeritas, <math>\vec \mathbf x^'</math>
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