如图所示，半径为R的均匀带电薄圆盘，电荷面密度为<img src="https://static.zxtiku.com/wangke/imgs/topic/4f7cc3fe0b00f67a95dc39454420ef4d.jpg"/>。当盘以角速度<img src="https://static.zxtiku.com/wangke/imgs/topic/a866df97fcf00807464ff41e360d179b.jpg"/>绕其中心轴OO'旋转时，盘心O点的磁感应强度大小为：<br/> <img src="https://static.zxtiku.com/wangke/imgs/topic/a4a864beeade96c7eee64010cec695f3.jpg"/><br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/9faf18c713aa715781badcf3529ae44b.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/6acd8b75e983675013310a123c948ec2.jpg"/><br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/ae940e3aeb66f5725a1951ee1e0e3f37.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/1b1abee13a6d8778c4d870b536df4b7d.jpg"/>