Coulomb's Law (Electric Force) Video Lessons

Concept

# Problem: 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

###### FREE Expert Solution

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 × 109 Nm2/C2 (Coulomb's Constant)
• q1 = - 40.0 × 10-6 C
• q2 = + 108 × 10-6 C
• r = ? (separation between the charges)
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###### Problem Details

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