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New finite formulae to compute potential at any point due to a point current source located anywhere in a two layer earth are developed in this paper. Nonlinear programming is used to evolve the expressions such that the error with respect to a large data obtained from the usual infinite series expressions of potential is minimized. The formulae reported in the paper can significantly save the computational effort in the analysis and design of a grounding system with negligible loss in accuracy.
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Seedher et al. (1987) studied this question.
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