Coulomb's Law (magnitude) (F = k |q1 q2| / r²)
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F = k |q1 q2| / r²
What each symbol means
| Symbol | What it stands for |
|---|---|
| F | Electrostatic force magnitude between two point charges (N) |
| r | Distance between charges (m) |
| q_1,q_2 | Point charges (C); use signs separately for direction |
| \varepsilon_0 | Permittivity of free space (F/m) |
When to use this
Point charges in vacuum (or use ε for medium via k→k/εr). Static charges. Superposition holds for multiple pairs.