The Physics
Hypertextbook
Opus in profectus

Coulomb's Law

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Summary

F =  k  q1q2
r2
Where…
ke =  8.99 × 109 Nm2/C2
…is the electrostatic constant
F =  1   q1q2
4πε0 r2
Where…
ε0 =  8.85 × 10−12 C2/Nm2
…is the vacuum permittivity