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magnetic flux (F)

The total magnetic field of a coil is called the magnetic flux (Phi). In the model of the magnetic field, this is the total number of magnetic field lines of a coil.

The magnetic flux has the unit volt- second (Vs) with the special unit name Weber (Wb) and results from the product of the magnetic flux density B and the area "A" through which it passes perpendicularly, Phi corresponds to B x A. The unit name Weber is named after the German physicist Wilhelm Eduard Weber (1804 - 1891). According to this, one Weber corresponds to the magnetic flux which produces an electromotive force of 1 volt in one turn when it continuously falls to zero in one second (1 Wb = 1 Vs = `10^-8` Maxwell).

Magnetic flux in a homogeneous magnetic field

Magnetic flux in a homogeneous magnetic field

The magnetic flux has the direction of the magnetic field. Outside the magnetic field the field lines run from the north to the south pole. If the field cross-section A is crossed at right angles by the flux Phi, the magnetic flux density "B" results from the quotient of Phi/A.

When passing through air gaps, a part of the field lines runs outside the cross section "A". A stray field Phi(S) is generated, which reduces the total flux Phi(G). The difference between the total flux and the stray field applies to the effective flux.

Englisch: magnetic flux - F
Updated at: 21.01.2022
#Words: 224
Links: magnetic field (H), coil, magnetic flux, indium (In), unit (U)
Translations: DE

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