Need help understanding Lenz's Law

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Homework Help Overview

The discussion revolves around understanding Lenz's Law and its application to determine the direction of induced current in various scenarios involving magnetic fields and resistors.

Discussion Character

  • Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore how changes in magnetic fields affect induced currents, questioning the direction of current flow based on the setup described. There is a focus on understanding the implications of the windings' orientations and their effect on the magnetic field.

Discussion Status

Participants are actively engaging with the problem, with some clarifications being made regarding the orientation of the windings and its impact on the magnetic field. There is a recognition of the need to reassess the initial assumptions about current direction.

Contextual Notes

There is mention of an attached image that may provide additional context, but its content is not described in the discussion. The original poster expresses confusion regarding the application of Lenz's Law, indicating a potential gap in understanding fundamental concepts.

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Homework Statement


I'm trying to find the direction of the current given certain situations, but do not know how to apply Lenz's Law. Attached a image below-
10ees9f.jpg


2. The attempt at a solution

So I figured out how each situation affects the induced current, and that the magnetic field is to the left. For a), the closing of the switch causes an increased magnetic field. If that's the case, shouldn't the current at resistor R flow to the right? The answer is left.
 
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pdf said:
So I figured out how each situation affects the induced current, and that the magnetic field is to the left. For a), the closing of the switch causes an increased magnetic field. If that's the case, shouldn't the current at resistor R flow to the right? The answer is left.
You do realize the windings are in opposite directions, yes?
 
Oh I missed that- whoops! So that means that the magnetic field for resistor R is going towards the right, therefore resulting in the current going left when the magnetic field is increased and towards the right when decreased?
 
pdf said:
Oh I missed that- whoops! So that means that the magnetic field for resistor R is going towards the right, therefore resulting in the current going left when the magnetic field is increased and towards the right when decreased?
Yes.
 
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