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5 lis 2020 · When the coil of a motor is turned, magnetic flux changes, and an electromotive force (EMF), consistent with Faraday’s law of induction, is induced. The motor thus acts as a generator whenever its coil rotates.
In physics, specifically electromagnetism, the magnetic flux through a surface is the surface integral of the normal component of the magnetic field B over that surface. It is usually denoted Φ or Φ B. The SI unit of magnetic flux is the weber (Wb; in derived units, volt–seconds), and the CGS unit is the maxwell. [1]
The magnetic flux linkage is a quantity commonly used for solenoids which are made of N turns of wire; The flux linkage is defined as: The product of the magnetic flux and the number of turns of the coil. It is calculated using the equation: Flux linkage = ΦN = BAN. Where: Φ = magnetic flux (Wb) N = number of turns of the coil; B = magnetic ...
Faraday’s Law. The emf ε ε induced is the negative change in the magnetic flux Φ m Φ m per unit time. Any change in the magnetic field or change in orientation of the area of the coil with respect to the magnetic field induces a voltage (emf).
When a magnet is moved into a coil of wire, changing the magnetic field and magnetic flux through the coil, a voltage will be generated in the coil according to Faraday's Law. In the example shown below, when the magnet is moved into the coil the galvanometer deflects to the left in response to the increasing field.
Magnetic flux is the product of the average magnetic field times the perpendicular area that it penetrates. It is a quantity of convenience in the statement of Faraday's Law and in the discussion of objects like transformers and solenoids.
The magnetic flux through a loop of area A is Φ = BA cosη, where η is the angle between the normal to the loop and the magnetic field. (a) The loop is perpendicular to the field; hence, η = 0, and Φ = BA. (b) The loop is parallel to the field; therefore, η = 90° and Φ = 0.
