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Coulomb's Law — result sheet
Calculate the magnitude and attraction or repulsion relationship for two point charges at a stated separation.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Electrostatic-force magnitude F = k |q1 q2| / r^2, using k = 8.9875517923e9 N m^2/C^2. Charge signs determine attraction or repulsion.
This calculator applies the point-charge Coulomb relation and reports electrostatic-force magnitude in newtons. It also identifies attraction for opposite signs or repulsion for like nonzero signs, without providing electrical safety advice.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- First charge — C; Finite signed charge in coulombs.; minimum -1000000; maximum 1000000
- Second charge — C; Finite signed charge in coulombs.; minimum -1000000; maximum 1000000
- Separation — m; Finite positive distance between the point charges.; minimum 1.0E-6; maximum 1000000000
Worked example
| Input | Value |
|---|---|
| First charge | 1.0E-6 |
| Second charge | -1.0E-6 |
| Separation | 1 |
Electrostatic force is 0.0089875517923 N and the charges attract.
Assumptions and limits
- Charges are finite signed point-charge values in coulombs and separation is a finite positive distance in metres.
- The Coulomb constant is fixed at 8.9875517923e9 N m^2/C^2, and the output reports magnitude while the signs provide the attraction or repulsion relationship.
- This is a point-charge electrostatics model only. Charge distributions, dielectric response, circuit behavior, electrical safety, and equipment advice are outside scope.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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