A.線圈沿垂直于磁場(chǎng)的方向平行移動(dòng) B.線圈以自身某一直徑為軸轉(zhuǎn)動(dòng),轉(zhuǎn)軸與磁場(chǎng)方向平行 C.線圈以自身某一直徑為軸轉(zhuǎn)動(dòng),轉(zhuǎn)軸與磁場(chǎng)方向垂直
A.π/4 B.π/2 C.π/3
A.E=ex40cos(90*108t-30x)V/m B.E=ex40cos(90*108t+30x)V/m C.