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Overview
Electric force is the force that charged objects exert on one another. It can attract or repel depending on the signs of the charges. Like charges repel, while opposite charges attract. Electric force is one of the fundamental interactions that shapes atoms, materials, circuits, chemistry, and many technologies.
Attraction and Repulsion
Positive and negative charges attract one another. Two positive charges repel, and two negative charges repel. The direction of the force depends on the signs and positions of the charges.
Coulomb's Law
Coulomb's law describes the size of the electric force between two point charges. The force grows with the amount of charge and weakens as distance increases.
Inverse-Square Behavior
Electric force follows an inverse-square relationship with distance. Doubling the distance between two point charges makes the force one fourth as strong.
Vector Nature
Electric force is a vector. It has magnitude and direction, so forces from multiple charges must be added using vector reasoning.
Comparison to Gravity
Electric force and gravitational force both follow inverse-square patterns, but electric force can attract or repel, while gravity is attractive in ordinary mass interactions.
Net Electric Force
When several charges act on one charge, the net electric force is the vector sum of all individual electric forces.
Role in Matter
Electric force helps hold atoms, molecules, and materials together. It also explains many contact forces at the microscopic level.
Common Mistakes
A common mistake is ignoring direction when adding electric forces. Another is assuming a larger charge always feels a larger acceleration, even though acceleration also depends on mass.
Why This Matters in Physics
Electric force connects charge to motion and prepares students for electric fields, potential energy, voltage, circuits, and electromagnetic systems.