运用正确的物理模型计算载流导电板的磁场

Calculating the Magnetic Field of a Current-carrying Plate with Correct Physical Models

通过对载流导电板内部、外部和表面的磁感强度的分析,说明对于同一个物理问題,从不同的角度分析时,应当选用的物理模型往往是不同的.因此在解决实际问题时,辨清物理模型的适用条件,选择正确的物理模型是非常必要的.

The magnetic flux density inside, outside and on the surface of a thin, infinite long current -carrying plate is analyzed. It is shown that the suitable physical model is usually not identical when we discuss a problem from different aspects. It is necessary to recognize the condition, which is suitable to the physical model, and to choose a right model when we try to solve the problems.