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What is Magnetic flux | Unit of magnetic Flux | Magnetic flux density and its Unit | Magnetic circuit


Magnetic Flux

The number of magnetic lines of force in a magnetic field determines the value of magnetic flux. The more the magnetic lines of force, the greater the magnetic flux and the stronger the magnetic field. the total number of magnetic lines of force produced by a magnetic source is called magnetic flux. It is denoted by the Greek letter f (phi).


A unit N-pole is supposed to radiate out a flux of one weber. Therefore, the magnetic flux coming out of the N-pole of m weber is

                                      f = m Wb

Now

                           1Wb = 108 lines of force

Sometimes we have to use a smaller unit of magnetic flux viz microweber (µWb).

                               1 µWb = 10–6 Wb = 10–6 × 108 lines = 100 lines


Magnetic Flux Density:


The magnetic flux density is defined as the magnetic flux passing normally per unit area i.e.

Magnetic flux density, B = φ/A Wb/m2


where f = flux in Wb

           A = area in m2 normal to the flux


The SI unit of magnetic flux density is Wb/m2 or *tesla. Flux density is a measure of field concentration i.e. amount of flux in each square meter of the field. In practice, it is much more important than the total amount of flux. Magnetic flux density is a vector quantity.






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