When a positively charge object is at a distance of a negatively charged object then an attractive force between them is exerted. The magnitude of that force is give by:
[tex]F=k\frac{q_1q_2}{r^2}[/tex]Where:
[tex]\begin{gathered} F=\text{ force} \\ k=\text{ Coulomb's constant} \\ q_1,q_2=\text{ charges} \\ r=\text{ distance} \end{gathered}[/tex]therefore, the right answer is C.
