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An orthogonal coordinate system in which an, exemplarily square, continuous charge distribution is drawn with the volume charge density \(\rho(\boldsymbol{r})\). The position vector \(\boldsymbol{r}\) goes from the origin to the location within the charge distribution which occupies the volume \(V\).

The field position vector \(\boldsymbol{R}\) goes to a field point where the electric field caused by the charge distribution is to be calculated.

Die Verbindungenvektoren \(\boldsymbol{R} - \boldsymbol{r}\) geht dabei von einem Punkt innerhalb der Ladungsverteilung zum betrachteten Feldpunkt. Dieser Verbindungsvektor ist wichtig für die Berechnung des elektrisches Feldes.