根据物理学的毕奥-萨法尔定理，计算环形线圈周围电磁场的强度-According to physics, Biot- Safar theorem, calculate the intensity of electromagnetic field around the circular coil. .

用java实现了翻页效果，可以添加任意数量的图片，然后填入参数即可-Page with a java implementation of the results, you can add any number of pictures, and then fill in the parameters can be