Mutually Induced EMF

Definition: The emf induced in a coil due to the change of flux produced by another neighboring coil linking to it, is called Mutually Induced emf. Let us take an example to understand the phenomenon of mutually induced emf Consider a coil AB. Coil B is having N2 number of turns and is placed near another coil…

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Self Induced EMF

Definition: Self-induced emf is the e.m.f induced in the coil due to the change of flux produced by linking it with its own turns. This phenomenon of self-induced emf can be further understood by the following example given below Consider a coil having N number of turns as shown in the above figure. When the…

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Magnetic Flux

Definition: The amount of magnetic lines of forces set up in a magnetic circuit is called Magnetic Flux. It is analogous to electric current I in an electric circuit. Its SI unit is Weber (Wb) and its CGS unit is Maxwell. It is denoted by φm Net numbers of lines passing through the surface are called…

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Electromagnet and Electromagnetism

If Electric current is passed in a simple magnet wound with the coil of insulated wire and the magnetic field is produced the magnet formed by this process is called Electromagnet. The core of the magnet which is wound with the wire is made of ferromagnetic or ferromagnetic materials such as iron. The magnetic field…

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Faraday’s Law Of Electromagnetic Induction

The name Faraday’s Law of Electromagnetic Induction is given in the name of a famous scientist Michael Faraday in 1930’s. It gives the relationship between electric voltage and changing magnetic field. Faraday’s Law of Electromagnetic Induction states that “ the magnitude of voltage is directly proportional to the rate of change of flux.” that means…

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Induced EMF

An Electromotive Force or EMF is said to be induced when the flux linking with a conductor or coil changes. This change in flux can be obtained in two different ways; that is by statically or by dynamically induced emf. They are explained below Contents: Statically Induced EMF Dynamically Induced EMF 1. STATICALLY INDUCED EMF…

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Permeance

Definition: Permeance is the ease with which flux can be set up in a material is measured.  It is reciprocal of reluctance (S) of the material in the magnetic circuit. It is denoted by (P) and is measured in Weber per ampere-turn (wb/AT) or Henry (H). It is analogous to conductance in an electric circuit. Permeance (P) =…

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Magnetic Reluctance

Definition: The opposition offered by a magnetic circuit to the magnetic flux is known as reluctance. As in electric circuit, there is resistance similarly in the magnetic circuit, there is a reluctance. Reluctance in magnetic circuit stores magnetic energy. It is denoted by (S) S= l/a µ0µr Reluctance depends upon the length (l) cross-sectional are…

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Magnetomotive Force

Definition: The current flowing in an electric circuit is due to the existence of electromotive force similarly magnetomotive force (MMF) is required to drive the magnetic flux in the magnetic circuit. The magnetic pressure, which sets up the magnetic flux in a magnetic circuit is called Magnetomotive Force. Its unit is Ampere-turn (AT). MMF =…

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Coefficient Of Coupling

The fraction of magnetic flux produced by the current in one coil that links with the other coil is called coefficient of coupling between the two coils. It is denoted by (k). Two coils are taken coil A and coil B, When current flows through one coil it produces flux; the whole flux may not…

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