Question in determing the direction of induced emf?

AI Thread Summary
To determine the direction of induced emf in an alternator, Lenz's Law and Faraday's Laws can be applied without referring to graphs. The key factor is the change in magnetic flux rather than the magnetic field (B) itself. When B and the area vector (dA) are perpendicular, no flux is present, emphasizing the significance of flux change in inducing emf. Understanding these principles allows for predicting the direction of induced emf effectively. The discussion highlights the importance of focusing on changes in magnetic conditions rather than static values.
ehabmozart
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How to determine the direction of emf induced in an alternator without the need to look at the graph. (i.e) using Lenz's Law or Faraday's Laws of determining the direction? Consider for example the instant when B and dA are perpendicular and no flux is present?

Thanks for helping!
 
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You do know Lenz's law, right? I don't know what more there is to say other than just repeating what Lenz's law again.

The direction of B doesn't matter. It is the change in B that matters, not B itself.
 

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