The Kerr effect measurements were performed for the dilute solutions of two samples of a cyclo-linear polymer, poly(decamethyl cyclohexasiloxane), and a series of low-molecular-mass cyclohexasiloxanes representing analogues of the repeating unit of this polymer. The corresponding dipole moments were determined. The experimental data showed that the electrooptical effect in the solutions of both high- and low-molecular-mass cyclohexasiloxanes has a dipole-orientational character. It was established that a decamethyl cyclohexasiloxane cycle is an element of the polymer chain that exhibits independent orientation in the external electric field. This element retains its conformation upon replacement of the side groups by other polar substituents.