EVERYDAY CLARITY
Coulomb Law Calculator
What electrostatic force acts between these point charges? Enter the stated values to calculate this model.
Your result
Signed radial force
N
Result for the values shown.
Calculations run in your browser.
What to enter
| Input | Meaning and units |
|---|---|
| First charge (C) | Enter first charge in C; use the same basis as the other measurements. |
| Second charge (C) | Enter second charge in C; use the same basis as the other measurements. |
| Separation (m) | Enter separation in m; use the same basis as the other measurements. |
Understanding your result
Read Signed radial force (N) in the units and model stated on this page. The formula force=8.9875517923e9*q1*q2/(r*r) defines the relationship; measurement accuracy and model applicability are separate from numerical precision.
Common mistakes
- Mixing input units or changing the physical meaning of a variable without changing the model.
Check your calculation
- Use the worked example as a known reference case, then change one input at a time and check the direction and units of the response.
Calculation checks, sources and review limits
What electrostatic force acts between these point charges?
What electrostatic force acts between these point charges? Enter the stated values to calculate this model.
Common uses
- What electrostatic force acts between these point charges
How it works
force=8.9875517923e9*q1*q2/(r*r)
Worked example
Enter First charge: 0.000001 C; Second charge: 0.000002 C; Separation: 0.1 m. Results: Signed radial force: 1.79751035846 N.