求解二维泊松方的电势电场的放电问题，利用的是有限差分的方法-Solving the potential of the electric field of the two-dimensional Poisson side discharge problems, using the finite difference method

模拟电场线的生成，设计程序模拟两个任意电荷的电力线，并在计算机屏幕上显示-Simulation of electric field line