Electromagnetic Induction – Faraday’s Law, Generators & Superconductivity Explained | Chapter 29 of University Physics
Electromagnetic Induction – Faraday’s Law, Generators & Superconductivity Explained | Chapter 29 of University Physics Chapter 29 unveils how changing magnetic fields produce electric currents and voltages—an effect central to generators, transformers, and countless modern devices. You’ll learn Faraday’s and Lenz’s laws, explore motional emf, nonconservative induced fields, eddy currents, Maxwell’s unification of electricity and magnetism, and the remarkable phenomenon of superconductivity. Watch the full video summary here for detailed examples and visual demonstrations. Magnetic Flux & Faraday’s Law Magnetic flux through a loop is: Φ B = B · A · cos φ , where B is the field, A the loop area, and φ the angle between them. Faraday’s Law states that a changing flux induces an emf: ℰ = – dΦ B /dt . For N loops: ℰ = – N dΦ B /dt . The negative sign embodies Lenz’s Law, ensuring the induced emf opposes the flux change. Lenz’s Law Lenz’s Law dictates that the ...