Discussion
Nucleons in nucleus are bound by
Answer: D
Nucleons are bound by short-range nuclear forces.
The strong nuclear force holds protons and neutrons together. It is the strongest of the fundamental forces but acts only over very short distances, about 2-3 femtometres, roughly the size of a nucleus, and it is nearly the same between any pair of nucleons whether charged or not.
Electromagnetic (electrostatic) forces push protons apart, so they work against binding. Gravity is far too weak at this scale. Nuclear forces are short-range, not long-range, which is why very large nuclei become unstable.
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