According to the potential and its normal derivative on the surface, the potential and field intensity on the ground can be calculated by a numerical method.
根据电位和法向导数，可用数值方法计算地面的电位和电场强度。
Afterwards, using the boundary element method to solve the integral equation we can obtain the magnetic potential and its normal derivative on the surface of the magnetic body.
然后用边界单元法解积分方程，求得磁性体表面的磁位及其法向导数。
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