Article details

Title: Solving an Electrostatic Potential Determination Problem
Author(s): Andreea CreoÈ™teanu   Gheorghe Gavrilă            

Abstract: In solving field problems, there are mainly three types of techniques: experimental, analytical, and numerical. Experiments are expensive, time consuming, and usually do not allow much flexibility in parameter variation. In this article we will consider the last two solving methods. Analytical methods are the most rigorous ones, providing exact solutions, but they become hard to use for complex problems. Numerical methods have become popular with the development of the computing capabilities, and although they give approximate solutions, have sufficient accuracy for engineering purposes. The problem we have studied is determining the distribution of electrostatic potential inside a conducting rectangular box having one of the armatures at potential and the other three at 0 V potential. Two methods were considered in solving the problem: the separation of variables analytical method and the finite difference numerical method. The numerical algorithm was implemented in MATLAB program. We compared the results to the analytical method, and raised the number of iterations until we reached a order difference between last iterations values. The grid step size was also optimized, to minimize the error of the numerical solution. This way, the same accuracy was obtained with a much smaller number of iterations. All the results obtained with the numerical method were compared to the exact analytical solution.

Keywords: electrostatic potential, analytical methods, numerical methods, error optimization


[1] M.N.O. SADIKU – Numerical Techniques in Electromagnetics, Second Edition, CRC Press, 2000
[2] G. GAVRILĂ – Electrotechnics Basics, Vol. III, Military Technical Academy Publishing House, Bucharest, Romania, 1995 (in Romanian)
[3] D. POLJAK – Advanced Modeling in Computational Electromagnetic Compatibility, John Wiley & Sons, Hoboken, NJ, 2007
[4] D. IOAN, I. MUNTEANU, B. IONESCU, M. POPESCU, R. POPA, M. LAZĂRESCU, G. CIUPRINA – Numerical Methods in Electrical Engineering, MATRIX ROM Publishing House, Bucharest, Romania, 1998 (in Romanian)
[5] L. JEBLI – A Comparison of Two Methods for Solving Electromagnetic Field Integral Equation, International Journal of Differential Equations, Vol. 2011, 2011,