Magnetic Circuits

Information about Magnetic Circuits

Published on July 23, 2014

Author: islavatu

Source: authorstream.com

Content

Magnetic Circuits: Magnetic Circuits Chapter 2 Composite magnetic circuits: Composite magnetic circuits Series magnetic circuit Series magnetic circuit: Series magnetic circuit Series parallel magnetic circuits: Series parallel magnetic circuits Leakage flux and fringing: Leakage flux and fringing Useful flux: The flux which is available at the air gap and it can be utilized for some useful purpose Leakage flux: The flux which completes its path through the air or the medium surrounding the magnetic circuit instead of completing it through the core and the air gap Leakage factor ( ) = Magnetic fringing:   Leakage flux and fringing: Leakage flux and fringing Electromagnetic induction: Electromagnetic induction Faradays experiment Faraday’s First law:: Faraday’s First law: Any change in the  magnetic field  of a coil of wire will cause an e.m.f to be induced in the coil. This e.m.f induced is called induced e.m.f and if the conductor circuit is closed, the current will also circulate through the circuit and this current is called induced current. Method to change magnetic field: 1. By moving a magnet toward or away from the coil 2. By moving the coil into or out of the magnetic field. 3. By changing area of a coil placed in the magnetic field 4. By rotating the coil relative to the magnet. PowerPoint Presentation: Faraday's Second Law It states that the magnitude of e.m.f induced in the coil is equal to the rate of change of flux linkages with the coil. The flux linkages of the coil is the product of number of turns in the coil and flux associated with the coil . Applying lenz’s law Applications of Faraday Law: Applications of Faraday Law Electrical Transformers Electrical Generators Induction cookers Electromagnetic flow meters Form the basis of electromagnetic theory Musical instruments Lenz’s law: Lenz’s law Lenz law states that when an emf is generated by a change in magnetic flux according to Faraday's Law , the polarity of the induced emf is such that it produces an  electric current  whose magnetic field opposes the change which produces it . The negative sign is used in  Faraday's law of electromagnetic induction , indicates that the induced emf ( ε ) and the change in magnetic flux ( δΦ B   ) have opposite signs. PowerPoint Presentation: Thank You

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