Different magnets with a coil, what are the currents?

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Homework Help Overview

The discussion revolves around the behavior of currents induced in a coil by different magnet configurations, specifically examining three scenarios depicted in an attached image. Participants are exploring the principles of electromagnetic induction, including the effects of magnetic flux changes on current direction and flow.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the resulting currents in the coil for each scenario, particularly whether the first two scenarios yield the same current direction and if there is any current in the third scenario. Additionally, there is an inquiry into the relationships between voltage, current, and EMF with various parameters of the system.

Discussion Status

Some participants have provided insights regarding the direction of current flow based on changes in magnetic flux and have indicated that there is no current in the third scenario due to a lack of flux. Others have raised further questions about the proportional relationships between voltage, current, EMF, and specific parameters of the system, indicating an ongoing exploration of these concepts.

Contextual Notes

Participants are operating under the assumption that the magnet's size is sufficient to avoid edge effects, which is relevant to the discussion of current flow in the third scenario. There is also a reference to Lenz's Law as a foundational concept for understanding the relationships among the discussed parameters.

Holchr
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Hi.
Can someone please explain/tell me what would be the resulting currents trough the coil in every of the three depicted scenarios in the attached picture, I'm confused here. Would the first and the second drawing produce the same result? Is there any current flow in the third drawing.
Thanks.
 

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    magnetsandcoils.jpg
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Holchr said:
Hi.
Can someone please explain/tell me what would be the resulting currents trough the coil in every of the three depicted scenarios in the attached picture, I'm confused here. Would the first and the second drawing produce the same result? Is there any current flow in the third drawing.
Thanks.

The first and second will produce current in opposite direction(since change in magnetic flux is opposite in direction, due to, magnetic fields through the coil are in opposite direction), there is NO current in the third picture because of NO flux through coil(assuming the magnet is big enough to not have edge effects).
 
Thanks a lot universal. I got just one more question so I'd really appreciate help.

When a magnet passes trough a coil, there are three points of interest to me. The VOLTAGE, the CURRENT, and the EMF (lenz effect, or the force exerted on the magnet by the field of the induced current) (maybe some of this is wrong but bear with me).

So I wanted to know to which of the parameters of the system are VOLTAGE, CURRENT and the EMF proportional, and to which inversely proportional, or is not affected by the parameter.

1. The number of turns in a coil
2. The diameter of the wire in a coil
3. The magnetic flux density of the permanent magnet
4. The velocity of the magnet trough the coil.

Thanks.
 
Holchr said:
Thanks a lot universal. I got just one more question so I'd really appreciate help.

When a magnet passes trough a coil, there are three points of interest to me. The VOLTAGE, the CURRENT, and the EMF (lenz effect, or the force exerted on the magnet by the field of the induced current) (maybe some of this is wrong but bear with me).

So I wanted to know to which of the parameters of the system are VOLTAGE, CURRENT and the EMF proportional, and to which inversely proportional, or is not affected by the parameter.

1. The number of turns in a coil
2. The diameter of the wire in a coil
3. The magnetic flux density of the permanent magnet
4. The velocity of the magnet trough the coil.

Thanks.

The answers to most of your questions are covered by Lenz's Law:

http://en.wikipedia.org/wiki/Lenz's_law

Are you familiar with it yet?
 

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