Online Coulomb's Law Calculator
Coulomb's Law calculator evaluates electrostatic attraction and repulsion between electric point charges. Essential for electromagnetism physics and engineering.
Coulomb's Law Calculator
Compute electrostatic force between charges, electric field strength, or solve for distance and charge
Calculation Results
How to use
- Enter electric charge values q1 and q2.
- Specify separation distance r between charge centers.
- Select dielectric permittivity medium (default vacuum / air).
- Obtain calculated force magnitude in Newtons and interaction direction.
Calculation Example
For two point charges of 1 μC spaced 0.1 m apart in vacuum:
First charge: 1 μC
Second charge: 1 μC
Distance between charges: 0.1 m
Electrostatic force: ≈ 0.90 N
Like charges repel each other, opposite charges attract.
Calculation Methodology
Calculations follow Coulomb's inverse-square formula: F = k * |q1 * q2| / (ε * r²), where k ≈ 8.988 × 10⁹ N·m²/C² is Coulomb's constant in vacuum.
Frequently Asked Questions
What does Coulomb's Law define?
It quantifies electrostatic interaction force acting between stationary electrical charges.
What are the SI measurement units?
Force in Newtons (N), charge in Coulombs (C), and distance in meters (m).
How does distance affect the force?
The electrostatic force drops inversely with the square of distance (doubling distance quarters the force).
Do charge signs influence interaction direction?
Yes. Identical polarity charges repel, while opposite sign charges attract each other.
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