如图1-1-15所示,线框与通电直导线均位于水平面内,当线框abcd由实

如图1-1-15所示,线框与通电直导线均位于水平面内,当线框abcd由实线位置在水平面内向右平移,逐渐移动到虚线位置,线框中是否产生感应电流?

1-1-15

答案

解:直线电流I产生的磁场的磁感线的形状是以导线上的点为圆心的在竖直平面内的一组同心圆,在电流I的右边磁感线的方向垂直水平面向内,在电流I的左边磁感线的方向垂直水平面向外.磁感线的疏密分布是越靠近导线,磁场越强,离导线越远,磁场越弱.线圈在移动过程中,其所在处的磁场强弱在发生变化,因此会产生感应电流.

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