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Electromagnetic and strong force

 
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Feb19-12, 10:10 AM   #1
 

Electromagnetic and strong force

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=yTkoj...eature=related
 
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Feb19-12, 10:35 AM   #2
 
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Protons and neutrons are made of quarks, which are point particles. The strong force is a force between quarks.
 
Feb19-12, 11:31 AM   #3
 
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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.
 
Feb20-12, 06:39 AM   #4
 

Electromagnetic and strong force

What does residual mean?
 
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