关于biot命令的用法？

千年老妖

在磁场分析中经常出现biot命令，意思是用毕——定律计算电流产生的磁场，帮助已翻了多次，仍不得要领，有没有高人能详细指点？

fengchen1

例子看了么？

VM170

Magnetic Field From a Square Current Loop

Overview
Reference: W. B. Boast, Principles of Electric and Magnetic Fields, Harper & Brothers, New York, NY, 1948, pg. 199-200.
Analysis Type(s): Coupled-field Analysis (ANTYPE = 0)
Element Type(s): Coupled Thermal-Electric Line Elements (LINK68)  
Input Listing: vm170.dat

Test Case
A current, I, is carried in a square loop of side a. The space about the current is air. Determine the magnetic flux density at point P, at a height b above the current loop.