Magnet pole question in generation

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Discussion Overview

The discussion revolves around the effects of exposing a coil to a moving magnetic field that consists solely of north poles. Participants explore whether this scenario would produce alternating current or have no effect at all, delving into the implications of such a magnetic configuration.

Discussion Character

  • Exploratory
  • Debate/contested
  • Technical explanation

Main Points Raised

  • Some participants question the feasibility of a "magnetic field with only north poles," suggesting it may not have a physical basis.
  • One participant proposes a scenario where multiple bar magnets are aligned with their north poles facing up, moving past a coil, and discusses the expected induced voltage.
  • It is suggested that the induced voltage would be less than if both north and south poles were involved in the magnetic field changes.
  • Participants express confusion about the original question and request clarification or visual aids to better understand the concept being discussed.

Areas of Agreement / Disagreement

Participants generally do not agree on the concept of a magnetic field consisting solely of north poles, with some expressing skepticism about its physical validity. The discussion remains unresolved regarding the implications of such a field on induced current.

Contextual Notes

There are limitations in the assumptions made about the nature of magnetic fields and the conditions under which coils interact with them. The discussion does not resolve the mathematical or physical implications of the proposed scenarios.

Quix270
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What would happen if a coil it’s exposed to a moving magnetic field with only north poles? Coils being exposed to only North Pole. Will produce alternate current or nothing?
 
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Quix270 said:
What would happen if a coil it’s exposed to a moving magnetic field with only north poles? Coils being exposed to only North Pole. Will produce alternate current or nothing?
What is a "magnetic field with only north poles" ? Sounds like a unicorn to me.
 
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phinds said:
What is a "magnetic field with only north poles" ? Sounds like a unicorn to me.
What would happen if a coil is exposed to North Pole of magnet who are in movement?
 
Quix270 said:
What would happen if a coil is exposed to North Pole of magnet who are in movement?
You did not answer my question. Again, what is a "magnetic field with only north poles" ? Sounds like a unicorn to me.
 
Quix270 said:
What would happen if a coil it’s exposed to a moving magnetic field with only north poles? Coils being exposed to only North Pole. Will produce alternate current or nothing?

Try to sketch what you mean and attach an image to your post. As @phinds signaled your statement now doesn't make physical sense so most likely there is some misunderstanding somewhere.
 
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Quix270 said:
What would happen if a coil is exposed to North Pole of magnet who are in movement?
Putting on my mind-reading hat for a moment, maybe the OP means what would happen if a number of bar magnets were joined together mechanically like a picket fence:

https://images-na.ssl-images-amazon.com/images/I/51wAPPFtMwL._SX425_.jpg
1565017894848.png


With all the "N" poles at the top. Then run the top of the fence left-to-right past a horizontal pickup coil to see what the induced voltage would be.

@Quix270 -- if this is what you mean, you will still get an AC pickup voltage induced in the coil, but it will be smaller than if the full "N" - "S" - "N" poles were run past the coil. The induced pickup voltage is proportional to the change in the flux through the coil area, so if you are just doing "N" - <zero> - "N" changes in the flux, that will be around half of what you can get if you change the flux all the way in each cycle N-S-N.

Look at the graph below and imagine it is the flux through the coil. Instead of going a full amplitude plus-to-minus, it is changing less because it is mostly one-sided. If it were the flux due to a full N-S-N changing flux, the amplitude of the change in the flux would be larger and evenly distributed above and below the zero line.

Does that help?

https://i.pinimg.com/originals/63/2e/6d/632e6ddab778fd995fc718b62b74b28c.png
1565018193308.png
 
berkeman said:
Putting on my mind-reading hat for a moment
Ah, you optimist you :smile:
 
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