一个同轴圆柱形电容器，内外导体半径分别为a和b，长为l。设外加低频电压<img src="https://static.zxtiku.com/wangke/imgs/topic/84865a72e43c80e7dd12df32d764e5cf.jpg"/>,电容器内外导体间的位移电流<img src="https://static.zxtiku.com/wangke/imgs/topic/eaf40777140d74441efbd31e0102bca9.jpg"/>与内外导体上的传导电流<img src="https://static.zxtiku.com/wangke/imgs/topic/0c4e046604e1c7a80f22989ed8fee17f.jpg"/>间的关系是（）<br/> A、<img src="https://static.zxtiku.com/wangke/imgs/topic/70d5e7fb1a059ecb25a23f0aa0b7a0a5.jpg"/><br/> B、<img src="https://static.zxtiku.com/wangke/imgs/topic/0a79c56f82be59f3c68e36b57d67ec76.jpg"/><br/> C、<img src="https://static.zxtiku.com/wangke/imgs/topic/8e5d877ada8c6875a1dca8f04784d7af.jpg"/><br/> D、<img src="https://static.zxtiku.com/wangke/imgs/topic/7a8b8aafeaaac3e3ae7bce0cb847668e.jpg"/>