One of the four Maxwell's equations, Gauss's law for magnetism, asserts that the net magnetic flux across a closed surface equal zero. Magnetic Flux Through Open and Closed Surfaces In reality, the terms magnetic flux density and magnetic field magnitude are frequently used interchangeably.Īlso Check: Induced Electromotive Force and Current We could easily declare the units of flux density in Tesla since we are dividing flux by area. The magnetic flux density is a related word that you may stumble across. In the event that the magnetic field reading varies with position, the average reading must be determined. Since magnetic flux is just an expression of the magnetic field in a specific location, it can be detected with a magnetometer in the same way that the magnetic field can.Īssume a tiny magnetometer probe is moved about (without spinning) inside a 0.5m 2 region near a big sheet of magnetic material and returns a consistent reading of 5Mt. (5.10 -3 T).(0.5 m 2) = 0.0025 Wb denotes the magnetic flux through the location.
The Si-derived unit of magnetic flux is the Weber (named after the German physicist and founder of the telegraph Wilhelm Weber), and the sign is Wb. Read more: Electromagnetic Induction and Alternating Currents Important Questions No matter how tiny the volume, magnetic forces are always dipole sources (similar to micro bar magnets), with as many magnetic field lines pouring in (to the south pole) as out (from the north pole). The total magnetic flux on a closed surface is always equal to zero ( Gauss' law of magnetism). The input to magnetic flux for a particular area is equal to the area multiplied by the magnetic field component perpendicular to the region. The magnetism of one tesla is rather powerful. The tesla is the International System (SI) unit of field "magnetic flux density" (T). While providing a formal definition, examine the wider idea of the magnetic field. Magnetic flux density is a vector field with SI units of tesla that we denote with the sign B. It is expressed in Webers per square meter, which is equivalent to Tesla. By B=H, Flux Density (B) is connected to Magnetic Field (H). Magnetic Flux Density is the quantity of magnetic flux passing through a unit area perpendicular to the direction of the magnetic flux. Θ= The angle formed by the magnetic field and the normal to the surface. The magnetic flux rate is a vector quantity that relies on the direction of the magnetic field. Paramagnetic matters: If the relative permeability of the matter is a little bit higher than 1 then we say these matters are paramagnetic.įerromagnetic matters: If the relative permeability of the matter is higher than 1 with respect to paramagnetic matters then we say these matters are ferromagnetic matters.Magnetic flux is represented by the symbol ØB, where B represents a magnetic field and the unit is Weber (Wb). Relative permeability is the ratio of a specific medium permeability to the permeability of vacuum.ĭiamagnetic matters: If the relative permeability f the matter is a little bit lower than 1 then we say these matters are diamagnetic. Μ= B / H where H is the magnetic field strength and B is the flux density We find the permeability of the matter by following formula Magnetic permeability of the vacuum is denoted by µ oand has value Picture given below shows the behavior of magnetic field lines in vacuum and in two different matters having different µ. Magnetic permeability is the distinguishing property of the matter, every matter has specific µ. In this unit we learn magnetic permeability that is the quantity of ability to conduct magnetic flux.
In previous units we have talked about heat conductivity and electric conductivity of matters. In the second picture, since the angle between the normal of the system and magnetic field lines is 90º and cos90º=0 equation of magnetic flux become In the first one, magnetic field lines are perpendicular to the surface, thus, since angle between normal of the surface and magnetic field lines 0 and cos0=1equation of magnetic flux becomes Where Ф is the magnetic flux and unit of Ф is Weber (Wb)ī is the magnetic field and unit of B is TeslaĪ is the area of the surface and unit of A is m 2įollowing pictures show the two different angle situation of magnetic flux. We show magnetic flux with the Greek letter Ф. Magnetic flux is the number of magnetic field lines passing through a surface placed in a magnetic field.
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