Magnetic Reluctance: Correct Equation

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SUMMARY

The correct equation for Magnetic Reluctance is R = l / (μA), where R represents reluctance, l is the length of the magnetic path, A is the cross-sectional area, and μ is the magnetic permeability of the material. The alternative equation R = l / (μ₀μA) found in some textbooks is misleading unless μ is explicitly defined as relative permeability. The discussion confirms that the Wikipedia formula is accurate and emphasizes the importance of understanding the distinction between absolute and relative permeability.

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  • Ability to interpret scientific equations and units in physics.
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confusion321
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Which is the correct equation for Magnetic Reluctance ?

[tex]R[/tex] = Reluctance
[tex]l[/tex] = Length
[tex]A[/tex] = Area
[tex]\mu[/tex] = Magnetic Permeability of the material
[tex]\mu_0[/tex] = Magnetic Permeability of free space ([tex]4\pi \times 10^- ^7[/tex] tesla/ampere turn)

[tex]R = \frac {l} {\mu A}[/tex] as stated on Wikipedia or [tex]R = \frac {l} {\mu_0 \mu A}[/tex] as stated in my textbook.
 
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The Wikipedia formula looks correct. Are you sure your book isn't using [itex]\mu[/itex] to mean relative permeability (which is just a ratio)? (If not, the units would make no sense in your book's formula.)
 
Thanks very much that would be it. "Relative Permeability"
 

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