What is Faraday's Law of Induction?

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Homework Help Overview

The discussion revolves around Faraday's Law of Induction, specifically focusing on the relationship between current direction in wires and induced currents due to changing magnetic flux. Participants are exploring the implications of Lenz's Law in this context.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to understand the concept by relating the direction of currents in two wires, while another participant questions this reasoning and emphasizes the importance of magnetic flux and Lenz's Law.

Discussion Status

Some participants express understanding after the clarification provided, indicating that the discussion has led to a better grasp of the concept. However, there is no explicit consensus on the initial reasoning presented by the original poster.

Contextual Notes

Participants are navigating through the complexities of magnetic flux and induced currents, with references to classroom learning and external resources for further exploration.

dinhjeffrey
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Homework Statement



attachment.php?attachmentid=34851&stc=1&d=1303698759.jpg

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Homework Equations



faraday's law of induction


The Attempt at a Solution


umm i don't really understand this concept:frown: so here's my attempt. the answer is C so is it because if you have a wire within a wire and the current of one wire is going one direction, the current of the other wire always goes the opposite direction?
 

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No that is not a good way to think about it. If the current in the outer wire were decreasing, then they would be going the same way. You have to think in terms of flux. Lenz's law says: "An induced current is always in such a direction as to oppose the motion or change causing it"

The cause of the induced current is the changing magnetic flux through the loop. The flux is increasing into the page, so the wire on the inside needs to produce a flux out of the page to resist the change.

If the wire on the outside had its current decreasing then there would be less flux into the page, so the inside wire would have to produce more flux into the page, and the currents would be in the same direction.
 
thxthx i understand it now ^^
 
dinhjeffrey said:
thxthx i understand it now ^^

Good! Lenz's law is very cool. Check out this video on Lenz's Law.

 
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oh cool my teacher showed us this in class too! lool
 

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