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This lecture covers the concept of self-inductance and electromotive force (EMF) in the context of Faraday's induction law. The instructor explains how a changing magnetic field induces an EMF in a metallic ring, leading to the generation of a counteracting field. The lecture also delves into the Lenz rule, which states that systems resist changes in magnetic flux. Additionally, the concept of inductance is introduced to quantify the relationship between current and magnetic flux in a loop. The discussion extends to the implications of self-inductance on induced currents and the need for powerful power supplies in solid models.