如图甲所示把一条形磁铁插入闭合线圈或从闭合线圈中拔出线圈中会产生感应电流.若将该条形磁铁换成一通电螺线管如图乙所示把这个通电螺线管插入 Template




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tomski如图甲所示把一条形磁铁插入闭合线圈或从闭合线圈中拔出线圈中会产生感应电流.若将该条形磁铁换成一通电螺线管如图乙所示把这个通电螺线管插入 coloring