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confusion321

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[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.