如图所示条形磁铁静止在水平桌面上闭合铝环从条形磁铁的正上方附�由静止竖直下落至桌面.则在下落过程中a.铝环中产生方�不变的感应电流b.磁铁 Template




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tomski如图所示条形磁铁静止在水平桌面上闭合铝环从条形磁铁的正上方附�由静止竖直下落至桌面.则在下落过程中a.铝环中产生方�不变的感应电流b.磁铁 coloring