The Physics
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Opus in profectus

Coulomb's Law

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Summary

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