Does the Skin Effect cause charge to accumulate on the surface of a conductor?

Click For Summary
SUMMARY

The discussion centers on the skin effect in conductors and how to maximize surface charge accumulation. Participants clarify that to achieve a high surface charge, one must connect the conductor to a high voltage source, as the capacitance is fixed by geometry (C = Q / V). The skin effect, which increases resistance due to eddy currents, is distinct from surface charge accumulation. The conversation emphasizes the need for high-frequency AC currents (>1KHz) to ensure that currents flow predominantly on the surface of the conductor, particularly when using non-cylindrical geometries.

PREREQUISITES
  • Understanding of skin effect in conductors
  • Knowledge of capacitance and its formula (C = Q / V)
  • Familiarity with AC and DC current characteristics
  • Basic principles of electrolysis and surface currents
NEXT STEPS
  • Research high-frequency AC current applications in conductive materials
  • Explore methods to create and measure surface currents in non-cylindrical conductors
  • Investigate the effects of voltage and frequency on surface charge accumulation
  • Learn about the relationship between skin effect and eddy currents in various materials
USEFUL FOR

Electrical engineers, physicists, and anyone involved in designing conductive systems that require surface current management and optimization.

  • #31
Sibilo said:
the current follows the path with less resistance
A point of information; this is not true. Current is shared between multiple paths and the proportion of each share. relates to the resistance (the inverse of the resistance) of each path. This is very relevant to how anything you build will perform.
Sibilo said:
I really don't need an image or photo in my opinion,
You certainly do need one if you want to make any sense to us. I would go as far as to say that. if you can't draw your plan then you could never build your experiment.
 
  • Like
Likes   Reactions: vanhees71, davenn and berkeman
Physics news on Phys.org
  • #32
Baluncore said:
Such as liquid mercury or molten metal?

Which water surface with what? Across the boundary between the conductor and the electrolyte?
Or along the conductor surface, parallel to and within the conductor, but not along the electrolyte boundary equipotential contact with the conductor?

The conductive electrodes must be in contact with the electrolyte for an electron or ionic current to flow. If you place conductive electrodes on the surface of an electrolyte solution, an ionic current will flow deep through the volume of the solution. Ions move both ways through the liquid electrolyte, while electrons move through the conductive metal electrode. The ionic current flows through the bulk of the liquid, not along its external surface.

It is only where the electron current that flows in the conductor, is converted to an ionic current flowing in the electrolyte, that electrochemical reactions take place between the conductor and the electrolyte.

The EM skin effect is only significant in materials that make excellent electrical conductors.
Yes, you said it right, in fact in electrolytes we are talking not about electronic conduction but about the migration of ions. Furthermore, I didn't know that the skin effect doesn't work in electrolytes and therefore there is no conduction on the surface, this puts me in difficulty. I have to place the conductive electrodes in contact with the surface of the electrolyte liquid, without going deep but just touching it. furthermore I cannot use a DC because in this case I would start a chemical reaction, electrolysis. so now considering the question of electrolytes, how can I make the current flow on the surface? or more generally, how can I make the current spread as much as possible throughout the entire volume of the electrolyte, therefore also in depth?
 
  • #33
Sibilo said:
... how can I make the current flow on the surface?
Use a thin sheet of electrolyte, maybe between two glass plates, with electrodes at opposite edges between the plates.

How can you have an AC or DC current flow, without a chemical reaction at the electrode-electrolyte contact ?

You are wasting our time by not explaining what you are actually trying to achieve.
 
  • Like
Likes   Reactions: Sibilo and vanhees71
  • #34
Baluncore said:
You are wasting our time by not explaining what you are actually trying to achieve.
Yeah, agreed. OP is now on a short leash in this thread...
 
  • Like
Likes   Reactions: Sibilo and Bystander
  • #35
Baluncore said:
Use a thin sheet of electrolyte, maybe between two glass plates, with electrodes at opposite edges between the plates.

How can you have an AC or DC current flow, without a chemical reaction at the electrode-electrolyte contact ?

You are wasting our time by not explaining what you are actually trying to achieve.
ok gentlemen I will do some tests for each object I use. no but I'm not wasting your time, as I already said, these are small experiments that I want to do out of curiosity, so maybe I'll do some tests and see what happens.
 
  • #36
berkeman said:
Yeah, agreed. OP is now on a short leash in this thread...
no Berkemann I'm not in a corner, but I've already said that I want to do some tests with many different conductive objects, so I'll start doing the tests
 
  • #37
It's a bit lenghty to do it here in the forum, but why don't you just try to solve Maxwell's equations for the field given an (infinitely long for simplicity) conducting cylindrical wire? You find a thorough discussion in A. Sommerfeld, Lectures on theoretical physics, vol. 3.
 
  • Like
Likes   Reactions: berkeman, sophiecentaur and Sibilo

Similar threads

  • · Replies 2 ·
Replies
2
Views
1K
  • · Replies 9 ·
Replies
9
Views
3K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 3 ·
Replies
3
Views
572
  • · Replies 5 ·
Replies
5
Views
1K
  • · Replies 15 ·
Replies
15
Views
2K
  • · Replies 8 ·
Replies
8
Views
2K
  • · Replies 4 ·
Replies
4
Views
2K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 36 ·
2
Replies
36
Views
6K