匀强磁场<img src="https://static.zxtiku.com/wangke/imgs/topic/bd344250b914b645171c988c348e9792.png"/>垂直于以<img src="https://static.zxtiku.com/wangke/imgs/topic/15715323ba8c1480377ed12e1ce7c108.png"/>为半径的圆面，以该圆周为边线作两个曲面<img src="https://static.zxtiku.com/wangke/imgs/topic/5faf35cdf97a1db96ab8d36bea01b0af.png"/>和<img src="https://static.zxtiku.com/wangke/imgs/topic/a60cc2d6ed6587767b03a4add0b8799e.png"/>，如图所示，则通过<img src="https://static.zxtiku.com/wangke/imgs/topic/5faf35cdf97a1db96ab8d36bea01b0af.png"/>和<img src="https://static.pphuashu.com/wangke/imgs/topic/a60cc2d6ed6587767b03a4add0b8799e.png.png"/>的磁通量<img src="https://static.zxtiku.com/wangke/imgs/topic/50f8e807aec99a3dfb4189fc2edd4230.png"/>和<img src="https://static.zxtiku.com/wangke/imgs/topic/41f058211851c060baf026292ec8ac7f.png"/>分别为<br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/31845e0d3e4d6df83ba0a368c4d6d870.png"/>