Coulomb’s law
Force magnitude between two point charges in SI.
Calculator
How to use
Coulomb
k = 1/(4πε₀); result is magnitude.
Educational use only. Check signs, units, and modeling assumptions (e.g. flat Earth g, no air resistance unless stated).
Force magnitude between two point charges in SI.
k = 1/(4πε₀); result is magnitude.
Educational use only. Check signs, units, and modeling assumptions (e.g. flat Earth g, no air resistance unless stated).
Model / formula
F = k |q₁q₂| / r² (SI)
Result
3.5950e+0 N (magnitude, k = 1/4πε₀)