Change a magnetic flux and you make a voltage. That is Faraday's law, \( \varepsilon = -\Delta\Phi_B/\Delta t \), and it is how generators, transformers, and induction cooktops earn a living. Practice induction free below with multiple choice (MCQ) questions and quizzes, graded instantly.
Lenz's law supplies the minus sign: induced current always fights the change that made it. Ask what the flux is doing, then pick the current that opposes it.
Practice 65 questions on Faraday's Law & Induction below with free multiple choice (MCQ) and quizzes, graded instantly.
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