The mathematical term that denotes the amount of flux leaving or entering a point is called divergence. Hence, divergence represents the volume density of moving flux from an infinitesimal source. It is a scalar product.
The value of the divergence of a vector is positive when the vector field points outward from the region (point of location).
The following equation shows the divergence (∇•) of an electric potential field.
∇• (k∇u)=0
References: http://mathinsight.org/divergence_idea
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