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Answer Posted / md. zakir hosen
We know that,The air gap controls the amount of magnetic
field produced for a given current. In the equation
∫H·dL = n i , H is quite small in the iron because of its
high permeability. Nearly all of the integral accumulates in
the air gap even though the gap is very small compared to
the part of the closed path length in the iron. It reduces
the tendency of the iron to saturate to avoid harmonics in
the current.
thanking u
http://a2zengineering.blogspot.com/
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