In my physicsbook they show that the induced voltage in a metal rod is e=lvB, and after that show that that can be written as [tex]e=-\frac{d\phi}{dt}[/tex](adsbygoogle = window.adsbygoogle || []).push({});

But how do you prove that this actually apply to any rod or circuit, not just to a metal rod moving through a uniform B-field?

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# Proof of induction

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