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This lecture covers the concept of electric fields and potentials, starting with the calculation of the electric field due to point charges and collections of charges. It then explores the relationship between electric field strength and potential energy, emphasizing the significance of electric potential in understanding electrostatics. The lecture also delves into the potential of point charges and continuous charge distributions, illustrating how these properties depend on the source charges. Additionally, it discusses the behavior of charged disks and the relationship between electric field lines and equipotential lines. The session concludes with an explanation of charges in electric fields, introducing the concept of electronvolts as a measure of energy in electric systems.