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Coulomb force
Estimate electrostatic force between two point charges in vacuum.
Calculators / Science / Point-charge electric field
Point-charge electric field calculator
Calculate the radial electric field of a point charge in vacuum.
On this page
Signed radial field898,755.18N/C
Calculator controls
How to calculate
Calculate the radial electric field of a point charge in vacuum.
Signed radial field = 8.9875517923e9*q/1e6/r^2 N/C
Worked example
Source charge (µC): 1; Distance from charge (m): 0.1.
Signed radial field: 898,755.18 N/C.
Assumptions and limits
Positive field points away from a positive charge; negative field points toward a negative charge. Other charges and dielectric materials are excluded.
Results are rounded for display; calculations use unrounded values. Read our calculation methodology.
Understanding the result
Calculate the radial electric field of a point charge in vacuum.
When this tool is useful
Signed radial field = 8.9875517923e9*q/1e6/r^2 N/C
Understanding your inputs
| Input | What to enter |
|---|---|
| Source charge (µC) | Enter a number of at least -1000000000000 and no more than 1000000000000. |
| Distance from charge (m) | Enter a number of at least 1e-12 and no more than 1000000000000. |
Frequently asked questions
What assumptions does this calculation use?
Positive field points away from a positive charge; negative field points toward a negative charge. Other charges and dielectric materials are excluded.
How is the result calculated?
Signed radial field = 8.9875517923e9*q/1e6/r^2 N/C