Electric charge and electric force | AP Physics | Khan Academy

Electric charge is a scalar quantity and is described as positive or negative. Coulomb’s law describes the electrostatic force between two charged objects as directly proportional to the magnitude of each of the charges and inversely proportional to the square of the distance between the objects. The direction of the electrostatic force depends on the signs of the charges of the interacting objects and is along the line of separation between the objects. Free space has a constant value of electric permittivity that appears in physical relationships. Sections: 00:00 - What is electric charge? 01:39 - Positive and negative charge in atoms 02:30 - The elementary charge 04:03 - Coulomb’s law 06:00 - Coulomb’s constant and permittivity 07:36 - How materials affect electric force 09:18 - Adding forces from multiple charges 11:57 - Summary ------------------ Khan Academy is a nonprofit organization with the mission of providing a free, world-class education for anyone, anywhere. Khan Academy has been translated into dozens of languages, and 15 million people around the globe learn on Khan A…

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