A question about electromagnetic induction

Click For Summary

Discussion Overview

The discussion revolves around the question of why changing magnetic flux in a coil induces electromotive force (emf). Participants explore theoretical, experimental, and conceptual aspects of electromagnetic induction, referencing historical figures and theories in physics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants suggest that the phenomenon is an axiom or postulate of Faraday's Law, with no deeper theoretical understanding currently available.
  • Others argue that while we have equations predicting behavior, the precise reason for the induction remains elusive, potentially linking it to quantum mechanics.
  • A participant proposes a scenario where turbulent air could induce emf by disturbing the magnetic flux, suggesting that the degree of turbulence would affect the magnitude of the induced emf.
  • Another participant mentions that the Lorentz force acting on charged particles in a magnetic field is a fundamental explanation, indicating that deeper discussions may involve relativity.
  • Some express skepticism about fully understanding the underlying causes, emphasizing that observations lead to models rather than definitive explanations.
  • A participant highlights the importance of Maxwell's equations and their relation to electromagnetic forces, suggesting that the electric field precedes current flow in conductive materials.
  • One participant raises a fundamental question about the magnetic moment of orbiting electrons and its relation to magnetic fields, indicating a potential area for further exploration.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the underlying reasons for electromagnetic induction, with multiple competing views and uncertainties expressed throughout the discussion.

Contextual Notes

Some claims depend on specific interpretations of electromagnetic theory, and there are unresolved assumptions regarding the nature of magnetic fields and their interactions with charged particles.

Ahmad Syr
Messages
20
Reaction score
0
Hi guys
I just want to know why changing magnetic flux in a coil induces emf?
Thanks in advance.
 
Engineering news on Phys.org
Might be a question better posed on the classical physics area of the forum. At any rate, I'm not entirely sure that anyone knows why it happens, just that it does. Through experimentation, and a lot of thinking, we've figured out the equations that seem to predict the behavior; but to know, precisely, why it occurs, so far as I know, eludes us. I suppose one might find some answer looking in QM, but I'm not versed enough in that to tell you yes one way or the other.
 
Last edited:
Hello people...imagine a magnet placed near a coil of many turns...now instead of moving the coil or magnet...will emf get induced when I force a turbulent Air in the gap between coil and magnet...becaz magnetic flux disturbed by air whose relative permeability changes when it moves turbulently...
 
Narayanan KR said:
Hello people...imagine a magnet placed near a coil of many turns...now instead of moving the coil or magnet...will emf get induced when I force a turbulent Air in the gap between coil and magnet...becaz magnetic flux disturbed by air whose relative permeability changes when it moves turbulently...
I think it will induce an emf. Its magnitude will depend upon the degree of turbulence.
 
  • Like
Likes   Reactions: Narayanan KR
Ahmad Syr said:
Hi guys
I just want to know why changing magnetic flux in a coil induces emf?
Thanks in advance.
Faraday observed the fact, as stated in Faraday's Law of Electromagnetic Induction. Maxwell later tried to put all the known laws of electricity and magnetism into a few equations, and suggested that a varying magnetic field produces an electric field. The electric field create an EMF between the ends of the conductor.
 
Ahmad Syr said:
Hi guys
I just want to know why changing magnetic flux in a coil induces emf?
Thanks in advance.
I'm pretty sure the guys over in the quantum physics forum will have an opinion. If you go that route, I might like to see their answer. I doubt I'll understand it, but hope seems a universal constant. :rolleyes:

I would guess it has something to do with exchanging virtual photons through quantum entanglement.
 
It derives from Lorenz force - a charged particle passing though a magnetic field will have a force applied to it - perpendicular to both the field and the direction of travel, from an EE understanding that should be the deepest it need to be looked at. Beyond that it becomes a discussion for relativity ( Sub atomic charged particles and E-M Fields - however not really entanglement)
 
Ahmad Syr said:
I just want to know why changing magnetic flux in a coil induces emf?

think it's something that was observed and made use of, not something that was figured out a priori from more basic facts.

F = QV cross B is what pushes the charge Q along the wire,
just as F= gm1m2/r2 pulls masses toward one another
 
  • Like
Likes   Reactions: cabraham
  • #10
1. change of magnetic field in space will create change in electric field despite the presence of conductor or not.-James Cleark Maxwell.

2. some how placing metal in that space electric field prefers to flow inside metal rather than vacuum since metal offers less resistance to electric field flow.

3. so i think electric field comes first then the current.

4. Personally speaking... Henry Lowrence worked for JP morgan and other capitalists and he Dumbed down Maxwellian and Heavyside equations to never reach overunity.
 
  • #11
Ahmad Syr said:
Hi guys
I just want to know why changing magnetic flux in a coil induces emf?
Thanks in advance.



best explanation on magnetism and induction check it bro!
 
  • #12
Ahmad Syr said:
Hi guys
I just want to know why changing magnetic flux in a coil induces emf?
Thanks in advance.
Other answers are good. But for the basic, underlying cause? We don't know.

The universe acts the way it acts. We observe that action and create models of how it acts based on experimentation. But there's always another "why" somewhere.

As for why Maxwell's equations work the way they do, it's because the electromagnetic force is a U(1) group. What does this mean? It means Maxwell's equations work the way they do. We know this from observation.

Science is all about observing and testing those observations. We seek unifying models, but those models are based on observation, not the other way around.

So there are many answers to your "why" depending on the answer you seek.
 
  • #13
The fundamental question is Why does an orbiting electron have a magnetic moment. - Or how is the movement of an electron (or charge) create a magnetic field. It is the interplay of these two things that make all of this happen. I had not looked into this but this seems like a pretty good
How Special Relativity Makes Magnets Work
 

Similar threads

What factors determine the resistance and inductance in a coil?
  • · Replies 2 ·
Replies
2
Views
2K
Induction heater with high Q factor
  • · Replies 8 ·
Replies
8
Views
2K
Electromagnet magnetic field issue
  • · Replies 27 ·
Replies
27
Views
2K
Back EMF cancelation question with multiple coils wound on the same core
  • · Replies 10 ·
Replies
10
Views
2K
Magnets with Halbach array in an AC generator
  • · Replies 6 ·
Replies
6
Views
3K
Electromagnet Polarity Switching for Reversed Motion
  • · Replies 7 ·
Replies
7
Views
3K
Measuring the inductance of a micron feature size gold coil
  • · Replies 5 ·
Replies
5
Views
2K
Equivalence of various forms of flux linkage
  • · Replies 4 ·
Replies
4
Views
2K
When does self-induction happen?
  • · Replies 2 ·
Replies
2
Views
2K
Calculation of induction heating setup power consumption
  • · Replies 5 ·
Replies
5
Views
2K