It means that the magnetic flux can be easily propagated in the iron as compare to air. We know that the reluctance (opposition to the flow of magnetic flux is called reluctance) of air is greater than the reluctance of iron. I 1 T 1 is for the charge, and L 1 T-1 is for the velocity. Let us take the dimensions of each term in the formula separately and derive the dimensional formula. In the given fig a coil with an iron rod in side it is shown. The magnetic field is formulated as B force / (charge x velocity). If we warped a copper wire around an iron rod then the iron rod is called iron core. EFFECT OF IRON CORE IN A COIL Effect of iron core in a coil The magnetic lines of force, which are emitting from North Pole and entering at the south pole of the magnet. We see that this field is similar to that of a permanent magnet. When current is passed through a coil than the collective magnetic field excess as shown in the figure. As shown in the fig Magnetic Field Direction to current in straight Conductor Circuit MAGNETIC FIELD OF A COIL Magnetic Field of Coil If the conductor is a straight wire the magnetic lines of force are in the form of concentric circle around the wire. When a current flows through a conductor, magnetic lines of force are set up which surround the conductor. Υ = υ 0 υ r H/m MAGNETIC FIELD DUE TO CURRENT IN STRAIGHT CONDUCTOR If its relative permeability, as compared to vacuum is υr, then its absolutes permeability is
#Magnetic flux formula for free
Hence, for free space,Ībsolute permeability = υ 0 = 4π x 10 -7 H/m absolutely, relative permeability of vacuum with reference to its self-only. It is allotted an absolute permeability of υ 0 = 4π x 10 -7 H/m. Every medium is supposed to posse's two permeability.įor measuring relative permeability, vacuum or free space is chosen as the reference medium. The phenomena of magnetism and electro magnetism are dependent upon a certain property of the medium called its permeability. ABSOLUTE AND RELATIVE PERMEABILITY OF A MEDIUM Where "H" number of turns, "I" current "L" length of coil. When current is passed through a coil having length of m, meter and N, turn then the magnetizing force is given by the fallowing formula Magnetizing Force The unit of magnetic flux density is Weber/m2.it is also called tesla. Where "B" is the magnetic flux density, (ϕ) is the magnetic flux and "A" is the area. Magnetic flux per unit area is called magnetic flux density. It is represented by phi (ϕ) and its unit is Weber. The lines of force are like a stretched elastic cord.The total number of magnetic lines of force of a magnet is called magnetic flux.Magnetic lines of forces that are parallel, and in the same direction repel each other.Magnetic lines lines never intersect each other.The lines start from the north pole and ends in the south pole.Where ε– electromotive force v – velocity of the boundary E – electric field B – magnetic field ø B – magnetic flux through the open surface d ℓ – infinitesimal vector element of the contour of ∂Σ Properties of Magnetic Flux The below-given formula shows the relationship between generated EMF with change in the flux. And, this changed flux produces an electromotive force. Magnetic flux for open surfaceĬurrent in the looped conductive wire cause change in the flux. If θ is 0 °, Cos 0 = 1, When the angle between the field and normal to the surface is is 0 °, B is perpendicular to the surface and, Magnetic flux through a closed surfaceĪccording to Gauss’s law, the total magnetic flux through a closed surface is equal to zero. If θ is 90 °, Cos θ = 0, When the angle between the field and normal to the surface is 90 °, B is parallel to the surface and, Where B – Magnitude of the magnetic field S – Surface area θ – the angle between the magnetic field lines and perpendicular distance normal to the surface area The magnetic flux also depends on the angle between the magnetic field lines surface area. The number of field lines passing through a given area is magnetic lines of forces. Now let us derive its formula for better understanding. What is Mass Communication? Definitions, Functions, Characteristics Magnetic Flux Formula
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