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如图9-2-15所示,有一匝接在电容器 C两端的圆形导线回路,垂直于回路平面以内存在着向里的匀强磁场 B,已知圆的半径 R=5 cm,电容 C=20 μF,当磁场 B以4×10 -2 T/s的变化率均匀增加时,则( )
图9-2-15 A.电容器a板带正电,电荷量为2π×10-9 C B.电容器a板带负电,电荷量为2π×10-9 C C.电容器b板带正电,电荷量为4π×10-9 C D.电容器b板带负电,电荷量为4π×10-9 C
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACAAAAAgCAYAAABzenr0AAAA5ElEQVRYR2NkGGDAOMD2M+B0wKpVq9huv/jbxPD/fxwDA4MkhQ59zsDIuEhVgrkuLCzsF7JZOB3QOml5B8P//+UUWoyqnZGxszovsoI4B0xc9gyfzxmZmb2rcsK3IRvWMWm599///7fgcfTz6vwoKWId8B+f75kZGX0q8iK3kugAhur8KJRQxx0FE5fhdQC5UTPqgNEQGA2B0RAYDYHREBgNgaETAuTW96TqG7yt4tbRFhGRIQBqHTP9+8dIoDUMTxqk5AK8zXKYiaDWMYhNpANIaJYPdMdkwLtmpOZnctUPeDkAAP6tmiH1ggTLAAAAAElFTkSuQmCC)
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