The magnetic flux belongs to magnetohydrodynamics which represents studying the movement of ionized gases and the carrying-out liquids with magnetic field. This indicator is most often applied in astrophysics. By means of it study circulation and convection of substance in stars, distribution of waves in the atmosphere of the Sun and many other things.
Instruction
1. Define location of a magnetic flux. In turn, you can consider the coil closed on a short period on which there will pass current. In this coil you will be able to define magnetic field With which energy has to be equal in unit of volume to B2/8P. Without ideal sources of tension (EMF) the current will decrease because of Joule losses. At the same time gradually there will be an induction EMF which will interfere with reduction of current. At this time magnetic energy will support current and to be spent gradually for heating of the conductor. Just the same process happens also in the continuous volume of the carrying-out gas in which the closed current circulates and there is a magnetic field. It follows from this that the magnetic flux for any time of t almost does not change. Besides, the contour for this time is deformed and the magnetic flux passing through it remains. In case of compression of a contour also tension of the most magnetic field will increase.
2. Pay attention that the magnetic flux implies the integral of a vector of an indicator of magnetic induction passing through a certain final surface. It can be defined through integral of the considered surface. At the same time, the vector element of the area of the considered surface can be determined by a formula: S=S*n where n is a single vector which is normal in relation to a surface.
3. Use other formula for calculation of a magnetic flux: Ф = BS, gdef is a stream of a vector; In - magnetic induction; S - the considered surface. This calculation needs to be used when the analyzed area is limited to any flat contour located in normal situation in relation to the direction of a certain uniform field.
4. Express a magnetic flux through circulation of vector potential of the considered magnetic field on this contour: Ф = A*l where l is a contour length element.