Coulomb's Law Calculator
Compute the electrostatic force F = kq₁q₂/r² between two charges.
Input Data
Q1
C
Q2
C
Distance
m
Results
F = k·q₁q₂/r².
0.89875N
At a glance:F = k·q₁q₂/r² (inverse-square). Complements coulomb-potential-energy and electric-field.
Formula
F = k·q₁q₂ / r².
$$F = k\,\dfrac{|q_1 q_2|}{r^2}, \quad k \approx 8.9875 \times 10^9\ \text{N·m}^2/\text{C}^2$$How to Use
- Enter charges and distance.
- The tool returns the force.
Case Studies
q₁=q₂=1e-6, r=0.1
F = 0.9 N.
FAQ
Like charges?
Repel (force positive); opposite charges attract.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.