acta satech Journal of the Life & Physical Sciences Babcock

The resonance method of determining the dielectric constant of a specimen (A4 Paper)
Kwaha* B. J. and E. Enyinna
Department of Physics, University of Jos, Jos. * Department of Chemical and Environmental Sciences, Babcock University, Ilishan-Remo
2009

ABSTRACT
An LC based resonance circuit consisting of precision electrodes was used to determine the dielectric constant of A4 paper. The resonance of the circuit (with air as the dielectric) was first determined by continuously adjusting the fine and coarse control knobs of the variable capacitor of the LC tank. The half power bandwidth bo of the resonance curve was found by adjusting the fine control. The A4 specimen was then inserted appropriately. A new resonance curve with new halfpower bandwidth was obtained. Harrop (1972) showed that the specimensí capacitance is a function of the change in variable capacitance needed to achieve resonance. This was then used to obtain the dielectric constant. The dielectric constant of the A4 paper specimen was obtained as 1.203, which was close to the expected value when compared with standard values obtained from published literature. The resonance method is quite flexible and may be used to determine the dielectric constant of industrial materials such as lubricating oils, transformer oils, egusi oil and other paper types.
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