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$$\mathbf{F}=\dfrac{1}{4\pi\varepsilon_0}\dfrac{q_1 q_2}{D^2}\mathbf{a}_D\quad \text{(N)} $$
$$\mathbf{E}=\dfrac{q}{4\pi\varepsilon_0D^2}\mathbf{a}_D\quad \text{(V/m)} $$