Coulomb constant
E621085
The Coulomb constant is a fundamental physical constant that quantifies the strength of the electrostatic force between two point electric charges in vacuum.
Statements (44)
| Predicate | Object |
|---|---|
| instanceOf |
electromagnetic constant
ⓘ
physical constant ⓘ |
| alsoKnownAs |
Coulomb’s law constant
NERFINISHED
ⓘ
electrostatic constant NERFINISHED ⓘ |
| appearsIn | Coulomb’s law NERFINISHED ⓘ |
| appearsInEquation |
E = k_e q / r^2
ⓘ
F = k_e q_1 q_2 / r^2 ⓘ U = k_e q_1 q_2 / r ⓘ |
| appliesTo | point charges in vacuum ⓘ |
| approximateValue | 9.0×10^9 N·m^2·C^−2 ⓘ |
| defines | strength of electrostatic interaction between two point charges in vacuum ⓘ |
| dependsOn | vacuum permittivity ⓘ |
| dimension | M^1 L^3 T^−4 I^−2 ⓘ |
| governs |
magnitude of electrostatic force between point charges
ⓘ
potential energy between point charges ⓘ |
| hasUncertainty | 3.0×10^−10 relative (CODATA 2018) ⓘ |
| hasUnit | N·m^2·C^−2 ⓘ |
| hasValue | 8.9875517923×10^9 ⓘ |
| independentOf |
charge magnitude scaling (linear in product q_1 q_2)
ⓘ
charge sign ⓘ |
| isContextDependent | true in choice of electromagnetic units ⓘ |
| isExact | false ⓘ |
| isFinite | true ⓘ |
| isFundamentalIn | inverse-square law of electrostatics ⓘ |
| isHomogeneousInSpace | true ⓘ |
| isHomogeneousInTime | true ⓘ |
| isIsotropic | true ⓘ |
| isPositive | true ⓘ |
| isScalar | true ⓘ |
| namedAfter | Charles-Augustin de Coulomb NERFINISHED ⓘ |
| relatedFormula | k_e = 1 / (4π ε_0) ⓘ |
| relatedTo |
Maxwell’s equations
NERFINISHED
ⓘ
electric field of a point charge ⓘ elementary charge ⓘ fine-structure constant ⓘ vacuum permittivity ε_0 ⓘ |
| symbol |
k
ⓘ
k_e ⓘ |
| systemOfUnits | SI ⓘ |
| usedIn |
atomic physics
ⓘ
classical electromagnetism ⓘ electrostatics ⓘ molecular physics ⓘ plasma physics ⓘ |
Referenced by (2)
Full triples — surface form annotated when it differs from this entity's canonical label.