Electromagnetic and strong force

  1. 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
     
  2. jcsd
  3. Protons and neutrons are made of quarks, which are point particles. The strong force is a force between quarks.
     
  4. jtbell

    Staff: Mentor

    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.
     
  5. What does residual mean?
     
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