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Electric Charges and Fields — Physics STD 12 Science — Question

Rajasthan BoardEnglish MediumSTD 12 SciencePhysicsElectric Charges and Fields1 Mark
Question
Force between the protons and neutrons in a nucleus is:
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Answer

CONCEPT:
Strong nuclear force: The strong attractive force which binds together the protons and neutrons in a nucleus is called a strong nuclear force.
  • This force cannot be an electrostatic force because positively charged protons strongly repel each other at such a small separation of the order $10^{-15}m.$
  • This strong nuclear force is the strongest of all the fundamental forces, about $100$ times stronger than the electromagnetic force.
Important properties of the strong nuclear force:
  • It is the strongest interaction known in nature, which is about $1038$ times stronger than the gravitational force.
  • It is a short$-$range force that operates only over the size of the nucleus $(= 10^{-15}m).$
  • It is basically an attractive force but becomes repulsive when the distance between the nucleons becomes less than $0.5$ fermi $(1$ fermi $= 10^{-15}m).$
  • It varies inversely with some higher power $(> 2)$ of distance.
  • It is a non$-$central and non-conservative force.
From the above, it is clear that the force between a neutron and a proton inside the nucleus is only nuclear attractive.

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