一个二维静电场，电位函数为 ，边界条件如题图所示，将正方形场域分成20个正方形网格。有十六个内部网格点。假定16个网格点的初始值为0，试用超松弛法确定16个网格点的电位值。-A two-dimensional electrostatic field, potential function, boundary conditions such as the title shown below, the square field divided into 20 square grid. Sixteen internal grid points. 16 grid points is assumed the initial value is 0, the trial of 16 over-relaxation method to determine the potential value of grid points.