Understanding Lenz's Law and the Right Hand Rule in Electromagnetic Induction

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Homework Help Overview

The discussion revolves around understanding Lenz's Law and the Right Hand Rule within the context of electromagnetic induction, specifically related to the behavior of magnetic fields and currents in two interacting loops.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the implications of Lenz's Law and the Right Hand Rule, questioning the direction of the magnetic field and current in response to changes in the system. There are attempts to reconcile differing interpretations of the magnetic field direction and the resulting current flow in the second loop.

Discussion Status

The discussion is ongoing, with participants raising questions about the assumptions made regarding the magnetic field directions and the effects of changing current. Some guidance is offered regarding the relationship between the loops, but no consensus has been reached on the correct interpretation of the problem.

Contextual Notes

Participants are grappling with the implications of a decreasing current in one loop and its effect on the magnetic field in another loop, as well as the resulting current direction needed to counteract this change. There is a noted confusion regarding the expected answer to the problem posed.

Rmehtany
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Homework Statement


upload_2016-4-8_19-34-1.png


Homework Equations


Not really? I just used the right hand rule and Lenz's law

The Attempt at a Solution



By the right hand rule, outside of loop 1, the magnetic field is out of the page. However, increasing resistance means that field is weakening. We know by Lenz's law that loop 2 will try to replace that field, so outside of loop two should be an out of the page magnetic field. This means the current direction is Clockwise, giving choice B

However, the answer is choice A. Why?
 
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Magnetic flux from the left loop will be linked with the right loop. What is the direction of field in the right loop because of the current flowing through the left loop? Since the current in the left loop is decreasing, to maintain the previous direction(and magnitude) of the field, current will flow through the right loop.
 
Wouldn't the field be out of the page because outside of the left ring, the field is out of the page?
 
Rmehtany said:
Wouldn't the field be out of the page because outside of the left ring, the field is out of the page?
Yes. But if that field is collapsing, in what direction should the current flow in order to resist this "change"?
 

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