why in transformer the magnetic flux by soft iron core is greater than that of magnetic flux by individual current?
Asked by nd films
20th September 2018,
7:29 PM
Answered by Expert
Answer:
Flux density in presence of magnetic materials is given by B = μ0(1+χ)H = μ0 × μr × H ...................(1)
where H is magnetic field intensity and it depends only on the current in the primary coil of transformer.
χ is magnetic susceptibility and μr= (1+χ) is relative permeability.
Hence for a given current without iron core, we have B = μ0H , because μr =1 for free space
In presence of iron core, for same current B = μ0 × μr × H
for ferromagnetic material like soft iron core, μr > 1000 , hence flux density increases more than 1000 times with soft iron core
Answered by Expert
21st September 2018,
2:36 PM
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