Ex) Article Title, Author, Keywords
New Phys.: Sae Mulli 2021; 71: 390-396
Published online April 30, 2021 https://doi.org/10.3938/NPSM.71.390
Copyright © New Physics: Sae Mulli.
Gun Hee KIM1, Hye Jin HA2, Sang Ho SOHN2*, Taehun JANG3
1Sangin High School, Daegu 42813, Korea
To estimate the dielectric constants of liquids we designed, a hollow acrylic box and derived formulas for the capacitance and the dielectric constant in a parallel plate capacitor with a hollow acrylic box. The dielectric constants of acrylic, distilled water, and sodium chloride aqueous solutions were obtained and compared with theoretical values. Due to the fringing effect, the measured capacitances of the parallel plate capacitor were found to have values different from the theoretical ones. Because our formulas for the capacitance do not involve the fringing effect, the experimental capacitance values should be corrected using the ratio of the experimental value to the theoretical value to lessen the error rates. By doing so, we obtained meaningful data for the dielectric constants and confirmed that the dielectric constant decreased linearly with increasing concentration of sodium chloride in an aqueous sodium-chloride solution.
Keywords: Parallel plate capacitor, Capacitance and dielectric constant, Fringing effect, Dielectric constant of liquid