Copper wire's effect on magnetic fields

Click For Summary

Discussion Overview

The discussion revolves around the effects of a coil of wire on magnetic fields, particularly in the context of achieving a net flux of zero in a changing magnetic field. It includes theoretical considerations, applications in transformers, and the mechanics of feedback systems.

Discussion Character

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

Main Points Raised

  • One participant questions how a coil of wire can help bring the net flux in a changing magnetic field back to zero.
  • Another participant suggests that a current flowing through the coil can cancel the flux, referencing the concept of a transformer when the flux originates from another coil.
  • A different participant inquires whether electrons are pushed through the wire by the magnetic field, proposing that each electron might have its own dipole.
  • Another contribution discusses the use of negative feedback, describing a closed loop control circuit involving a sensor coil, an inverting amplifier, and a coil to generate an opposing magnetic field.
  • Concerns are raised about the mechanical challenges of designing coils to effectively cancel the magnetic field and the placement of the sensor coil.

Areas of Agreement / Disagreement

Participants express various viewpoints on the mechanisms involved in canceling magnetic fields, with no consensus reached on the specifics of electron behavior or the practical implementation of the proposed systems.

Contextual Notes

Limitations include potential assumptions about the behavior of electrons in magnetic fields, the dependence on specific configurations of coils, and unresolved details regarding the design of the feedback system.

bdfischer
Messages
3
Reaction score
0
How can a coil of wire help bring the net flux in a changing magnetic field back to zero?
 
Physics news on Phys.org
By flowing a current which cancels the flux. When the flux originates from another coil the whole thing is called a Transformer.
 
are electrons simply pushed through the wire by this magnetic field? i.e. each individual electron with its own dipole
 
Using negative feedback. start with a sensor coil that detect the magnetic field, then feed the signal to a high gain inverting amp. The output of the amp drive the coil to generate an equal and opposite magnetic field to cancel the original field. basically it's a closed loop control circuit.

The electronic circuit is relatively easy to design, getting the mechanical dimension of those coil to really cancel the field might be difficult and also the placement of the sensor coil.
 

Similar threads

High School Why Does My Toaster Hum Due to AC-Induced Magnetic Forces?
  • · Replies 22 ·
Replies
22
Views
2K
Undergrad How induction works within a coil (nuances of it)
  • · Replies 6 ·
Replies
6
Views
2K
Undergrad Hall effect -- is it always applicable?
  • · Replies 7 ·
Replies
7
Views
3K
High School Magnetic field produced by an electric current
  • · Replies 5 ·
Replies
5
Views
2K
High School Magnetic generator multiple poles. Cancel out or short circuit?
  • · Replies 8 ·
Replies
8
Views
2K
High School Generator stator: Copper wire or copper sheets?
  • · Replies 5 ·
Replies
5
Views
4K
Undergrad Is This Correct Description of Magnetic Saturation?
  • · Replies 14 ·
Replies
14
Views
2K
Undergrad The vector math of relative motion of wire-loop & bar magnet
  • · Replies 1 ·
Replies
1
Views
2K
Undergrad Does a time varying magnetic field in vacuum produce electric field or not?
  • · Replies 7 ·
Replies
7
Views
2K
Undergrad Motional EMF in Faraday disc, co-rotating magnet axial mean flux
  • · Replies 5 ·
Replies
5
Views
1K