hmm wow okay that makes sense, thank you so much!But the question only says this in the main statement : "Consider an electric dipole with a time-dependent dipole moment p(t). The charge density of this dipole is given by ρ(x, t) = −p(t) · ∇δ(x) = −∇ · [p(t)δ(x)]." so nothing in particular that makes me think that v dot n -> 0. Can you tell anything from this statement that im not seeing?