Coulomb's Law (Electric Force) Video Lessons

Concept

# Problem: 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

###### FREE Expert Solution

From Coulomb's law, the force between two charges q1 and q2 separated by distance d is given by:

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

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###### Problem Details

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