Coulomb's law | Physics | Khan Academy
Courses on Khan Academy are always 100% free. Start practicing—and saving your progress—now! https://www.khanacademy.org/science/highschool-physics/x6679aa2c65c01e53:electrostatics/x6679aa2c65c01e53:coulombs-law/v/coulombs_lawCoulomb's law mathematically describes the electrostatic force two charged particles exert on each other. The force is equal to the Coulomb constant, multiplied by the two charges, divided by the distance between their centers squared. It is an inverse square law. Like charges repel and opposite charges attract. Contact forces such as tension and friction are fundamentally the result of electric forces between charged particles.
Sections:
00:00 - Intro
00:57 - The electrostatic force
02:57 - The unit of charge
03:54 - Charge vs mass
04:57 - Understanding Coulomb's law
07:27 - Value of Coulomb's constant
08:36 - Comparing Newton's law of gravitation and Coulomb's law
09:54 - Electrostatic forces result in contact forces
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