How the reluctance in a magnetic circuit depends on flux?

AI Thread Summary
Reluctance in a magnetic circuit is defined by the formula involving length, permeability, and cross-sectional area. It remains largely constant with respect to magnetic flux, as length and cross-sectional area do not change under typical conditions. The primary variable affecting reluctance is permeability, which is constant for free space and similar for most materials, except for ferromagnetic materials that exhibit a BH saturation curve. The discussion highlights that magnetorestriction may introduce minor variations in specific cases. Understanding these principles is essential for analyzing magnetic circuits effectively.
Aswin Sasikumar 1729
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Since reluctance is equal to length decided by product of permeability and area of cross section,how does reluctance change with flux?
 

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Aswin Sasikumar 1729 said:
Since reluctance is equal to length decided by product of permeability and area of cross section,how does reluctance change with flux?
Length divided by product of permeability and area of cross section
 
Aswin Sasikumar 1729 said:
how does reluctance change with flux?
That's a property of whatever is the medium through which you are pushing the flux.Try starting here

https://en.wikipedia.org/wiki/Permeability_(electromagnetism)

and would you be polite enough to rotate your image 90 degrees ccw?
 
Aswin Sasikumar 1729 said:
Sorry for the inconvenience

It's okay, you're pretty new here.

Aswin Sasikumar 1729 said:
Length divided by product of permeability and area of cross section

You already know the answer.
Length and cross section are not dependent on flux (excepting maybe magnetorestriction in iron)

that leaves permeability
which for free space is a constant
and
as that Wiki article explains for most other materials is very near the same constant
the big exception being ferromagnetic materials
which have the classic BH saturation curve.
220px-Permeability_by_Zureks.svg.png

Simplified comparison of permeabilities for: ferromagnets (µf), paramagnets (µp), free space (µ0) and diamagnets (µd)
 

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