DIVERGENCE OF A VECTOR FIELD
In the previous article, we have discussed del operator and gradient. Today, we will discuss another two operations of del known as divergence and curl.
The divergence of a vector at a given point in a vector field is a scalar and is defined as the amount of flux diverging from a unit volume element per second around that point.
The divergence of a vector at a point may be positive if field lines are diverging or coming out from a small volume surrounding the point.
On the other hand, if field lines are converging into a small volume surrounding the point, the divergence of a vector is negative. If the rate at which field lines are entering into a small volume surrounding the point is equal to the rate at which these are leaving that small volume, then the divergence of a vector is zero.
that is, div A = 0.