** **From Coulomb's law:

$\overline{){\mathbf{F}}{\mathbf{=}}\frac{\mathbf{k}{\mathbf{q}}_{\mathbf{1}}{\mathbf{q}}_{\mathbf{2}}}{{\mathbf{r}}^{\mathbf{2}}}}$

- F = 4.00 N (Force of attraction)
- k = 8.99 × 10
^{9}Nm^{2}/C^{2}(Coulomb's Constant) - q
_{1}= - 40.0 × 10^{-6}C - q
_{2}= + 108 × 10^{-6}C - r = ? (separation between the charges)

The force of attraction between a -40.0 μC and + 108 μC charge is 4.00 N. What is the separation between these two charges?

A) 1.13 m

B) 2.10 m

C) 3.12 m

D) 2.49 m

E) 3.67 m

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