Coulomb's Law (Electric Force) Video Lessons

Concept

# Problem: What is the repulsive force between two pith balls that are 8 cm apart and have equal charges of -30 nC?

###### FREE Expert Solution

Coulomb's law:

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

q1 = q2 = -30 nC(10-9C/1nC) = -30 × 10-9 C

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###### Problem Details

What is the repulsive force between two pith balls that are 8 cm apart and have equal charges of -30 nC?