Asymptotic formula for the capacitance of two oppositely charged discs

Weng Cho Chew, J. A. Kong

Research output: Contribution to journalArticle

Abstract

Asymptotic formulae for the capacitances of two oppositely charged, identical, circular, coaxial discs and two identical, infinite parallel strips separated by dielectric slabs are derived from the dual integral equations approach. The formulation in terms of dual integral equations using transforms gives rise to relatively simple Green’s functions in the transformed space and renders the derivation of the asymptotic formulae relatively easy. The solution near the edge of the plates, a two-dimensional problem previously thought not solvable by the Wiener-Hopf technique, is solved indirectly using the method. Solution of the Helmholtz wave equation is first sought, and the solution to Laplace’s equation is obtained by letting the wavenumber go to zero. The solution away from the edge is obtained by solving the dual integral equations approximately. The total charge on the plate is obtained by matching the solution near the edge and away from the edge giving the capacitance.

Original languageEnglish (US)
Pages (from-to)373-384
Number of pages12
JournalMathematical Proceedings of the Cambridge Philosophical Society
Volume89
Issue number2
DOIs
StatePublished - Mar 1981

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Capacitance
Asymptotic Formula
Integral Equations
Wiener-Hopf Technique
Coaxial
Helmholtz Equation
Laplace's equation
Strip
Green's function
Wave equation
Charge
Transform
Formulation
Zero

ASJC Scopus subject areas

  • Mathematics(all)

Cite this

Asymptotic formula for the capacitance of two oppositely charged discs. / Chew, Weng Cho; Kong, J. A.

In: Mathematical Proceedings of the Cambridge Philosophical Society, Vol. 89, No. 2, 03.1981, p. 373-384.

Research output: Contribution to journalArticle

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