Coulombs Law Calculator
Coulomb's Law Calculator
Use negative charge for electrons-like (−) and positive for protons-like (+). Opposite signs attract.
| Quantity | Value |
|---|---|
| Charge q₁ | 2 µC (2.000e-6 C) |
| Charge q₂ | -3 µC (-3.000e-6 C) |
| Separation | 0.1 m |
| Coulomb Constant k | 8.988 × 10⁹ N·m²/C² |
| Force | 5.393e+0 N |
| Force (μN) | 5.393e+6 µN |
| Interaction | Attractive (opposite signs) |
| Comparable Weight | 5.50e-1 kg |
Force vs Distance (1/r² falloff)
About Coulomb's Law Calculator
Coulomb's law gives the electrostatic force between two point charges: F = k·|q₁·q₂|/r², with k = 8.988 × 10⁹ N·m²/C². Charges are entered in microcoulombs (µC) — 1 µC = 10⁻⁶ C — and converted internally.
The Inverse-Square Nature
Because the electric field spreads over an expanding sphere, the force falls off with the square of the distance. This is the same geometric behavior that governs gravity, and it is why electrostatic forces dominate at atomic scales but fade quickly at macroscopic distances.
Frequently Asked Questions
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