Magnetic flux density ( B )
- It is defined as the magnetic flux per unit area of surface at right angle to the magnetic field. Its unit is weber per meter square
B = Φ / A
Where Φ = Flux in weber and
A = Surface area
Magnetic field
intensity ( H )
- The magnetic field intensity is the force required to maintain magnetic flux and it will produces particular value of magnetic flux.
- The magnetic field strength is measure of magnetic field produced by electrical current flows through coil.
- The magnetic flux density is directly proportional to magnetic field intensity.
B α H
B = μH
Where μ
= Constant
μ = μ0 μr
Where μ0
= Permeability of free space
= 4π × 10 – 7 weber /
ampere - meter
μr = Relative permeability of the medium
Relative
Permeability of different Medium
Medium |
Relative
Permeability |
Air |
1 |
Carbon
steel |
100 |
Electrical
steel |
4000 |
Super
conductor |
0 |
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