Discussion
The divergence of a vector field at a point measures
Answer: D
Correct answer: the net outward flux per unit volume from a vanishing volume there
Divergence is a source density: it reports how much of the field originates at the point, as the flux out of a small volume divided by that volume in the limit. That is exactly what makes \( \nabla\cdot\mathbf{D} = \rho_v \) the local form of Gauss’s law.
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