← Unit 8: Electric Charge and Electric Force
Coulomb's Law
The electric force between two point charges is proportional to the product of the charges and inversely proportional to the square of the distance between them — structurally identical to gravity's inverse-square form.
Overview
F = kq₁q₂/r². Like charges repel, opposite charges attract. Just like gravity, this is an inverse-square law: doubling the distance between charges cuts the force to 1/4.
Practice Quiz
Question 1 of 1Score so far: 0/0
Two point charges exert a force F on each other. If the distance between them is tripled, what is the new force?