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1.磁场随空间变化而变化例1在t=0时刻,磁场在xOy平面内的分布如图1所示.磁感应强度大小均为B_0,方向垂直于xOy平面.相邻磁场区域的磁场方向相
1. Changes in magnetic field with space changes Example 1 At time t=0, the magnetic field distribution in the xOy plane is shown in Fig. 1. The magnetic induction intensity is B_0 and the direction is perpendicular to the xOy plane. The magnetic field direction of the adjacent magnetic field