[Phys-L] : Magnetic Field at an Axial and Equatorial displacement from a bar magnet

[brian whatcott <betwys1@sbcglobal.net>]

We seem to be discussing how the magnetic field varies (externally) with 
angular displacements...

This shows a factor of two between polar and equatorial fields??

Brian Whatcott   Altus OK   Indian Territory.

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       *Magnetic field due to a bar magnet*

(i) at axial position (p):

B = \dfrac{\mu _0}{4 \pi} \dfrac{2M}{r^3}

(ii) at equatorial position (Q)

**

\dfrac{\mu _0}{4 \pi} \dfrac{M}{r^3}


(from http://www.sciencehq.com/physics/magnetism.html   )