1Electric Charge and Coulomb’s Law Coulomb’s Law of two point charges:Coulomb's law: The electrostatic force a charged particle exerts on another is proportional to the product of the charges and inversely proportional to the square of the distance between them. Force is a vector.The direction of the Coulomb force follows1. The line defined by the two point charges.2. Like charges repel, unlike charges attract.A reminder of Newton’s gravitational force here.2Electric Charge and Coulomb’s Law Coulomb’s Law of two point charges:Force is a vector.The direction of the Coulomb force follows1. The line defined by the two point charges.2. Like charges repel, unlike charges attract.3Electric Charge and Coulomb’s Law Example 1 of using Coulomb’s Law.gravitational constantG = 6.67×10−11N·m2/kg24Electric Charge and Coulomb’s Lawgravitational constantG = 6.67×10−11N·m2/kg25Electric Charge and Coulomb’s Law Example 2 of using Coulomb’s Law.6Electric Charge and Coulomb’s Law7Electric Charge and Coulomb’s Law Example 2 of using Coulomb’s Law.Assuming charges 1 and 3 are fixed in place. Charge 2 can move freely. Where to place charge 2 so that it experiences a zero net force from charge 2 and 3? Will the answer be different if we double the amount charge for charge 2?8Electric Charge and Coulomb’s Law9Electric Charge and Coulomb’s Law Formula of this chapter:Coulomb’s Law of electrostatic force between two charges:10Electric Charge and Coulomb’s LawConcepts of this chapter: Charge and charge conservation. Conductor, insulator and ground. Electrostatic force between charges.Electrodynamics: Electrodynamics studies charges in motion. Future
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