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(A) The nuclear force is a short-range force that acts between nucleons (protons and neutrons) within the nucleus.It is effective only at distances on

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$10^{-15} \, m$

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(A) The nuclear force is a short-range force that acts between nucleons (protons and neutrons) within the nucleus.It is effective only at distances on the order of $10^{-15} \, m$ (or $1 \, 	ext{fermi}$).Beyond this range, the nuclear force becomes negligible compared to the electrostatic repulsion between protons.Among the given options, $10^{-15} \, m$ is the characteristic range of the nuclear force. Since the original option A was $10^{-14} \, m$, which is the closest order of magnitude to the nuclear range, it is the correct choice.

Two protons exert a nuclear force on each other. The distance between them is approximately:

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