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$$ \displaystyle{\displaylines{B(z)=\frac{μ_0M}{2}(\frac{z}{\sqrt{z^{2}+R^{2}}}-\frac{z-L}{\sqrt{(z-L)^{2}-R^{2}}})}} $$ shows the relationship between the magnetic field strength and the distance between the magnet. I was wondering if this formula still applies when several cylindrical magnets are stacked together, north pole to south pole? If it does not, is there any way that I could adjust it for situations involving stacked magnets? Thanks.