Q 12-13-009NEETJEE MainEAMCET 2008 (Engineering)Easy
Let $F_{pp}$, $F_{pn}$ and $F_{nn}$ denote the magnitudes of the nuclear force by a proton on a proton, by a proton on a neutron and by a neutron on a neutron respectively, when the separation is less than one fermi. Then
Answer: (B) $F_{pp} = F_{pn} = F_{nn}$
Concept. The nuclear force is charge independent.
Step 1. Apply. At the same short separation the nuclear force is the same for proton–proton, proton–neutron and neutron–neutron pairs. (The electrostatic repulsion between protons is a separate force.)
Answer. $F_{pp} = F_{pn} = F_{nn}$ (Option B).
Solution by Sreeraj P, M.Sc Physics