What is the Difference Between Magnetic and Electric Flux?

Click For Summary

Discussion Overview

The discussion revolves around the definitions and implications of magnetic and electric flux, particularly in relation to closed surfaces. Participants explore the conditions under which flux is calculated and the relevance of closed versus open surfaces in different contexts, including Gauss's Law.

Discussion Character

  • Conceptual clarification
  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant questions the definitions of magnetic and electric flux, specifically regarding the concept of a closed surface.
  • Another participant notes that while flux can be calculated for both open and closed surfaces, closed surfaces are particularly important in the context of Gauss's Law.
  • A further clarification is provided that a closed surface fully encloses a volume, with normals pointing inwards and outwards.
  • It is mentioned that electric flux can be calculated through both open and closed surfaces, but closed surfaces are generally more useful due to their relation to enclosed charge.
  • Conversely, it is argued that magnetic flux is typically calculated for open surfaces, as the flux through a closed surface is zero in the absence of magnetic monopoles, and that the rate of change of flux through an open surface is related to induced potential.

Areas of Agreement / Disagreement

Participants express differing views on the definitions and applications of magnetic and electric flux, particularly regarding the use of closed surfaces. The discussion remains unresolved as multiple perspectives are presented without consensus.

Contextual Notes

There are limitations in the definitions provided, particularly concerning the assumptions about the nature of magnetic monopoles and the specific applications of Gauss's Law.

epilot
Messages
10
Reaction score
0
Hello guys,

just have a question.
are these definitions true for the magnetic flux and electric flux??:
Magnetic flux: The number of magnetic filed lines which are passing through a CLOSED surface.

Electric flux: The number of electric field lines which are passing through a CLOSED surface.

What is your idea about Closed surface in the above sentences?

Thanks.
 
Physics news on Phys.org
In general, when calculating the flux of a field, the surface can be either open or closed.

However, in some applications, most notably Gauss's Law, you specifically need to use a closed surface.
 
Thanks,

So when we want to define those ones then what do we tell??
 
A closed surface is a surface that fully encloses a volume. More specifically, of the two normals that the surface has, one will always be inside a fully enclosed volume while the other will always point into the open space.
 
Flux can be calculated for either. You can calculate the electric flux through either an open or closed surface, but the closed surface is usually more useful since it is related to the charge enclosed by Gauss's Law.

Conversely, magnetic flux is more often calculated for open surfaces since (ignoring the possibility of magnetic monopoles) the magnetic flux through a closed surface is zero. The rate of change of flux through an open surface however gives you the induced potential.
 

Similar threads

  • · Replies 24 ·
Replies
24
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 14 ·
Replies
14
Views
4K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 8 ·
Replies
8
Views
4K
  • · Replies 5 ·
Replies
5
Views
5K
  • · Replies 7 ·
Replies
7
Views
2K