We derive an expression for the effective dielectric function of a multicomponent mixture with small heterogeneities. The result is generalized to the case of a continuous medium with fluctuating dielectric function. Besides, we obtain an original expression for the effective dielectric function of a dilute suspension of spherical beads. Our result differs from the previously known one and appears to be physically more correct at higher bead volume fractions.
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S. E. Skipetrov (1999) studied this question.
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