【摘要】 本文给出了球坐标系下圆形电流回路磁感应强度(?)的一般表达式。进而讨论得出圆电流平面上圆心处(?)有最小值,而且无论圆内或圆外(?)可用同一表达式表示的结论。更多还原

【Abstract】 This essay gives out the common expression of the magnetic induction (?) for a circular current loop insphece Coordinate System and then proceeds to discuss how to work out the minimum of (?) on acircularl7 current loop plain and in the in the centre of a circle; furtnemore the conclusion of (?) in the circular or outside the circular will be expressed with the same expression.更多还原