一理想导体长矩形管，两边长度a、b分别为22.86mm和10.16mm，管内为空气，管壁电位分布如图所示。请分析管内电位分布。 -An ideal conductor long rectangular tube, the length sides a, b and respectively 22.86mm 10.16mm, the air tube, the wall potential distribution shown in FIG. Please analyze the potent