This paper introduces a dielectrophoretic system for the analysis Clausius-Mossotti factor. The literature in this domain has shown that the real part contains information calculated by the crossover frequency. We validated in this study that the imaginary part also contains the information calculated by the relaxation frequency. Our findings confirm a relationship between relaxation frequency and crossover frequency, and also the variation of the imaginary part as a function of real part, being a semicircle, and finally we applied our model of polystyrene in deionised water.