Electromagnetic and strong force

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Discussion Overview

The discussion centers on the comparison between the strong nuclear force and the electromagnetic force, particularly focusing on the range over which the strong force is dominant and the nature of these forces at the subatomic level. Participants explore concepts related to the forces acting within protons and neutrons, as well as the implications of these forces in terms of their origins and effects.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant notes that the strong nuclear force is stronger than the electromagnetic force at short ranges, specifically mentioning "up to two and a half times the proton diameter," and questions the starting point of this force and the reason for the approximation.
  • Another participant states that protons and neutrons are composed of quarks, which are described as point particles, indicating that the strong force operates between these quarks.
  • A different participant explains that the strong force between nucleons is a "residual effect" of the interactions among quarks, drawing an analogy to the van der Waals force as a residual effect of electromagnetic forces among nuclei and electrons.
  • One participant asks for clarification on the term "residual," indicating a need for further conceptual understanding.

Areas of Agreement / Disagreement

Participants present multiple perspectives on the nature of the strong force and its relationship to the electromagnetic force, with no consensus reached on the specifics of how these forces interact or the implications of their ranges.

Contextual Notes

The discussion includes assumptions about the definitions of forces and their interactions, and the term "residual" remains undefined, indicating potential gaps in understanding among participants.

johann1301
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I have heard that the strong nuclear force is stronger then the electromagnetic force at short ranges, "Up to two and a half times the proton diameter". Ok, so i have an approximation of the length it dominates over the electromagnetic force, but i don't know where the force starts from; is it at the center of the proton, or is it from the edge? And why does my source say "up to" and not exactly? Why is this length only an approximation??


source: look at 0:50
http://www.youtube.com/watch?v=yTkojROg-t8&feature=related
 
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Protons and neutrons are made of quarks, which are point particles. The strong force is a force between quarks.
 
The "strong force" between nucleons (protons and neutrons) is a sort of "residual effect" from the interactions among the quarks that they're composed of. It's analogous to the van der Waals force between atoms and molecules, which is a residual effect of the electromagnetic forces among the nuciel and electrons that they're composed of.
 
What does residual mean?
 

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