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2054Lecture10 - Faraday's Law of Induction Topics of...

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Unformatted text preview: Faraday's Law of Induction Topics of Discussion Induced & Motional EMF Magnetic Flux Faraday's Law of Induction Lenz's Law Self & Mutual Induction Induced & Motional EMF Recall that a current is the flow of charge through a cross-sectional area per unit time. The electromotive "force" (emf) measured in volts produces a flow of charges, called the induced current, in the presence of a changing magnetic field. So, it is the potential difference that produces an induced current. The flow of charges produced by a moving conductor is called the motional emf. Magnetic Flux The magnetic flux is a measure of the number of magnetic filed lines passing through a surface of area A, and it is given by = (Bcos)A where B is the magnetic field and is the angle between the magnetic field vector and the normal vector to the surface. Faraday's Law of Induction The average emf E induced in a coil of N is given by E = -N /t where is the change in magnetic flux through N loops of a coil in the time interval t. The SI unit of average emf E is volts. Lenz's Law An induced emf generates an induced current whose magnetic field opposes an increasing change in magnetic flux. Self and Mutual Induction Self-induction is a process in which an induced emf appears in any coil in which the current is changing. Mutual-induction is a process in which the changing current of one coil produces an emf in another coil. ...
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