CBSE 2025, Set 2

Question

Inside a nucleus, the nuclear forces between proton and proton, proton and neutron, neutron and neutron are $F_{pp}$, $F_{pn}$ and $F_{nn}$ respectively. Then : A). $F_{pp} > F_{pn} > F_{nn}$ B). $F_{pn} > F_{nn} > F_{pp}$ C). $F_{nn} > F_{pp} > F_{pn}$ D). $F_{pp} = F_{pn} = F_{nn}$

Edvaya · Accepted Answer

The correct answer is $F_{pp} = F_{pn} = F_{nn}$. The strong nuclear force is the fundamental force that holds the nucleus together.

One of the most important properties of the strong nuclear force is that it is **charge-independent**. This means that it does not distinguish between a proton and a neutron.

At a given separation distance (typically around $1	ext{ fm}$), the strong attractive force between a pair of protons ($F_{pp}$) is essentially the same as the force between a proton and a neutron ($F_{pn}$), which is the same as the force between two neutrons ($F_{nn}$).

Therefore, $\boxed{F_{pp} = F_{pn} = F_{nn}}$.

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