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The effect of changing particle radius on the ratio of M0 to H0 is shown for increasing values of B0, 0.1 T, 0.2 T and 0.35 T. The ratio saturates at large values of r as might be expected since the onset of magnetic saturation is earlier with increasing particle size. Again, solid volume fraction is ϕ = 0.002 and Md is assumed that for magnetite, Md = 446 × 103 A/m.
