Calculating your electrostatic force is straightforward once you know the Coulomb's Law formula and what each input means. This guide explains the method in plain language, walks through a manual calculation, and gives worked examples you can follow — then you can do it instantly with the Coulomb's Law Calculator.
What is Coulomb's Law?
The Coulomb's Law calculation tells you your electrostatic force from a few simple inputs. The figure you are solving for here is the electrostatic force.
The Coulomb's Law formula
This calculation combines several inputs through a multi-step method rather than a single one-line formula. Enter the values below and the calculator resolves each step in order. The inputs it needs are:
- Charge 1 — a value measured in C. Example: 0 C.
- Charge 2 — a value measured in C. Example: 0 C.
- Distance apart — a value measured in m. Example: 0.1 m.
How to calculate it step by step
- Write down the charge 1 (for example, 0 C).
- Write down the charge 2 (for example, 0 C).
- Write down the distance apart (for example, 0.1 m).
- Apply the formula above to get your electrostatic force.
- Double-check the result with the Coulomb's Law Calculator.
Worked examples
Example 1
| Input / Output | Value |
|---|---|
| Charge 1 | 0 C |
| Charge 2 | 0 C |
| Distance apart | 0.1 m |
| Electrostatic force | 0.898750 |
With charge 1 of 0 C, charge 2 of 0 C and distance apart of 0.1 m, the electrostatic force works out to 0.898750.
Example 2
With charge 1 of 0 C, charge 2 of 0 C and distance apart of 0.1 m, the electrostatic force works out to 1.797500.
| Result | Value |
|---|---|
| Electrostatic force | 1.797500 |
Example 3
With charge 1 of 0 C, charge 2 of 0 C and distance apart of 0.1 m, the electrostatic force works out to 4.493750.
| Result | Value |
|---|---|
| Electrostatic force | 4.493750 |
Tips for an accurate result
- Keep your units consistent — mixing, say, months with years or grams with kilograms is the most common source of error.
- Round only at the very end. Rounding inputs early can shift the final answer noticeably.
- Re-run the numbers whenever an input changes, rather than estimating from an old result.
Prefer not to do the maths by hand? — the Coulomb's Law Calculator does it instantly, for free, with the formula and a worked example built in.
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