Physics Formula
Coulomb's Law Formula Formula
Calculates the electrostatic force between two charged objects.
Formula Summary
Coulomb's Law Formula
Calculates the electrostatic force between two charged objects.
- Category
- Physics
- Equation
- F = kq₁q₂ / r²
- Calculator
- Use Coulomb's Law Formula Calculator →
Equation
F = kq₁q₂ / r²
Variables
- F = electric force
- k = Coulomb constant
- q₁ = first charge
- q₂ = second charge
- r = distance between charges
Units
- Force: Newton (N)
- Charge: Coulombs (C)
- Distance: meters (m)
- Coulomb Constant: N·m²/C²
When To Use This Formula
Use this formula when calculating the electrostatic force between two charged objects based on their charges and separation distance.
Rearranged Equations
- q₁ = Fr² / (kq₂)
- q₂ = Fr² / (kq₁)
- r = √(kq₁q₂ / F)
How to Use This Formula
- Identify the known values from the problem statement.
- Convert all values into compatible units.
- Substitute the values into the equation and calculate the result.
- Check that the final answer has the correct unit and meaning.