如图所示，平板电容器（忽略边缘效应）充电时，沿环路L1的磁场强度<img src="https://nimg.ppkao.com/2019-05/wangjing/2019051216393576531.jpg?sign=2b5cac115f6c1b4110fadb633576b672&t=62d5f8fe" />的环流与沿环路L2的磁场强度<img src="https://nimg.ppkao.com/2019-05/wangjing/2019051216393576531.jpg?sign=2b5cac115f6c1b4110fadb633576b672&t=62d5f8fe" />的环流两者，必有：（）<br /> <img src="https://nimg.ppkao.com/2019-05/wangjing/2019051216394790396.jpg?sign=f9f7232f6f5e868314af90ffc0ce7ecd&t=62d5f8fe" /><img src="https://nimg.ppkao.com/2019-05/wangjing/2019051216395557650.jpg?sign=c85ea7e1138f9b52c33f696fcbe0b980&t=62d5f8fe" />