Abstract-The dielectric constant (ε') and loss(ε")of polar liquids in solutions of benzene have been determined at room temperature (270C)at fixed microwave frequency (10.15 GHz). It is observed that dielectric constant and loss varies with concentration linearly. The studies report a determination of relaxation time (τ) electric dipole moment (µ) of Polar liquids in benzene solution at room temperature.

Experimental measurements of dielectric constant (ε") and loss (ε") of ethanol in dilute solutions of benzene at room temperature and at 10.15 GHz frequency were carried out by Gopala Krishna single frequency concentration method which based on Debye equation has been utilized to analyze the dielectric data (ε" and ε") to obtain relaxation time (τ) electric dipole moment (µ).The values of relaxation time (τ) and electric dipole moment (µ) are thus obtained in this investigation are encouraging by in agreement with literature values.