Modelová Otázka ID 3517 - 
Z jakého důvodu je v matematickém vyjádření Faradayova zákona 
pro indukované napětí znaménko minus?
Správná odpověď je: A, B
Faradayův zákon elektromagnetické indukce říká, že elektromotorické napětí indukované na vodiči Ui je přímo úměrné změně magnetického indukčního toku ve vodiči Δφ za čas Δt. Znaménko minus ve vzorci
vyjadřuje princip setrvačnosti, a sice že indukované napětí má takovou polaritu, aby jemu příslušný elektrický proud a elektromagnetické pole působily proti změně magnetického indukčního toku, která indukované napětí vyvolala. Tento poznatek shrnuje Lenzův zákon.
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