npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

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.

Measurement of Dielectric Constants of Liquids Using a Parallel Plate Capacitor

Gun Hee KIM1, Hye Jin HA2, Sang Ho SOHN2*, Taehun JANG3

1Sangin High School, Daegu 42813, Korea

2Department of Physics Education, Kyungpook National University, Daegu 41566, Korea
3Department of Physics, Kyungpook National University, Daegu 41566, Korea

Correspondence to:shsohn@knu.ac.kr

Received: January 7, 2021; Revised: January 22, 2021; Accepted: February 3, 2021

Abstract

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

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