From Coulomb's law, the force between two charges **q _{1} **and

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

1. When two point charges are a distance d apart, the electric force that each one feels from the other has a magnitude F. In order to make this force three times as strong, the distance between the charges would have to be changed to

(A) 3d

(B) sqrt(3d)

(C) d/(sqrt3)

(D) d/3

(E) d/9

(F) 9d

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