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根据毕—沙—拉定律,离电流源r处的磁感应强度为:整个圆电流在该处的磁感应强度在电动力学中的分量表达式为:
According to the Bi-Shala law, the magnetic flux density from the current source r is: The component of the magnetic flux density of the entire circular current in the electrodynamics is: