Moeller Eaton NZMB1-A50 感應電流的磁場總要阻礙引起感應電流的磁通量的變化，這就是楞次定律。楞次定律是判定感生電動勢方向的普遍定律，判定的對象是閉合回路，適用于一切電磁感應現象。
楞次定律
當磁鐵的N極移近導體線圈的上端時，由感應電流激發的磁場使線圈的上端也是N極，因為同名磁極相互排斥，所以阻礙磁鐵相對線圈向下的運動；而當磁鐵的N極離開導體線圈時，由感應電流激發的磁場使線圈的上端是S極，因為異名磁極相互吸引，所以阻礙磁鐵相對線圈向上的運動。
從能量轉化和守恒的角度來看，把磁體移近線圈時，外力要克服磁體和線圈之間的排斥力做功，使外界其他形式的能量轉化為電能；磁體離開線圈時，外力則要克服磁體和線圈之間的吸弓|力做功，也使外界其他形式的能量轉化為電能。在這兩種情況下，總能量是守恒的。
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