\[F=k\frac{q_1q_2}{r^2}\]
Variables
Felectrostatic force (N)
kCoulomb constant (N*m^2/C^2)
q1charge 1 (C)
q2charge 2 (C)
rdistance between charges (m)
Description
What is this formula?
This formula calculates the electrostatic force between two point charges using Coulomb law.
When to use it
Use it when analyzing electric interactions between charged particles separated by a distance.
Example
Data:
k = 8.99e9 N*m^2/C^2
q1 = 2e-6 C
q2 = 3e-6 C
r = 0.50 m
Formula:
F = k*(q1*q2)/(r^2)
Substitution:
F = (8.99e9*(2e-6*3e-6))/(0.50^2)
Result:
F = 0.216 N
Applications
Electrostatics, particle physics, electrical engineering, charge interaction analysis, and educational physics.