In this paper, evaluation of the accuracy of computation of electric field with Charge Simulation Method and exploration of the possibility of increased accuracy are discussed. The problem identified for this test could be solved by analytical method and hence the reference results are free from errors. This test problem can also be applied to other numerical codes to a limited extent. Simulation of this problem is done with a Hybrid Charge Method, which is a combination of Charge Simulation Method and Surface Charge Simulation Method.
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