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如图 所示,在 “ 探究产生感应电流的条件 ” 的实验中,开关断开时, 条形磁铁插入或拔出线圈的过程中,电流表表针不动 ; 开关闭合时 ,磁 铁静止在线圈中,电流表表针也不动 ; 开关闭合时,将磁铁插入或拔出 线圈的过程中,电流表表针发生偏转,由此得出,产生感应电流的条件是 : 电 路必 须 ,穿过电路的磁通量发生
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