Coulomb's Law is an essential principle of classical electromagnetism that quantifies the electrostatic force between two stationary, electrically charged particles. Much like Newton's law of universal gravitation, Coulomb's law dictates that the electric force is directly proportional to the product of the charges and inversely proportional to the square of the distance separating them. This principle is vital for understanding molecular bonds, atomic structures, and designing electrical components.
Coulomb's Law Equation
F = k × (|q₁ × q₂|) / r²
Where F is electrostatic force (Newtons), k is Coulomb's constant (8.987 × 10⁹ N·m²/C²), q₁ and q₂ are the magnitudes of the charges (Coulombs), and r is the distance between them (meters).
How to Use This Calculator
- Enter the magnitude of the first charge (q₁) in Coulombs.
- Enter the magnitude of the second charge (q₂) in Coulombs.
- Input the separation distance (r) between the centers of the two charges in meters.
- Click Calculate to determine the exact electrostatic force in Newtons.
Frequently Asked Questions (FAQ)
How do I know if the force is attractive or repulsive?
The fundamental rule of electrostatics is that "like charges repel, and opposite charges attract." If both charges are positive (or both negative), the resulting force pushes them apart. If one is positive and the other is negative, the force pulls them together.
Is electrostatic force stronger than gravity?
Yes, significantly. For basic subatomic particles like protons and electrons, the electrostatic force calculated by Coulomb's Law is roughly 39 orders of magnitude stronger than the gravitational force acting between them. This is why chemical bonds hold matter together so rigidly despite the weak pull of gravity.