Coulomb’s Law Charge Calculator
Coulomb’s Law Charge Calculator is a free online physics tool that calculates an unknown electric charge when you know the electrostatic force, the other charge, and the distance between the charges.
It is based on Coulomb’s Law:
F = k\frac{q_1q_2}{r^2}
What the calculator can calculate
If you know:
- Electrostatic force (F) — measured in newtons (N)
- Distance (r) — measured in meters (m)
- One charge (q₁ or q₂) — measured in coulombs (C)
- Coulomb constant (k) — approximately
8.9875 × 10⁹ N·m²/C²
The calculator can determine the unknown charge.
For example, if calculating q₂:
q₂ = F × r² / (k × q₁)
Example
Suppose:
- Force = 0.5 N
- Distance = 0.2 m
- q₁ = 2 × 10⁻⁶ C
Then the calculator determines the approximate value of the second charge.
Who can use it?
This free tool is useful for:
- Physics students
- High-school and college students
- Teachers
- Electrical engineering students
- Science educators
- Homework and exam preparation
- Checking Coulomb’s Law calculations
In simple terms: the Coulomb’s Law Charge Calculator helps you quickly find an unknown electric charge without having to rearrange the formula manually.
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