The electric field due to point charge:

$\overline{){\mathbf{E}}{\mathbf{=}}\frac{\mathbf{k}\mathbf{q}}{{\mathbf{r}}^{\mathbf{2}}}}$, where k is Coulomb's constant, q is the point charge, and r is the distance from the point charge.

From this equation, we can solve for r as:

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