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Physics · 2026 · 2 marks
CBSE 2026 · Region 1 · Set 1 · Q21
Draw the plot of potential energy of a pair of nucleons as a function of their separation. Write two important conclusions that can be drawn from…
Draw the plot of potential energy of a pair of nucleons as a function of their separation. Write two important conclusions that can be drawn from this plot.
Marking-scheme solution
Graph
Important conclusions
(i)
Potential energy is minimum at a distance $\displaystyle r_{0}$ of about $\displaystyle 0.8$ fm
(ii)
Force is attractive for distances larger than $\displaystyle 0.8$ fm.
(iii)
Force is repulsive for distances smaller than $\displaystyle 0.8$ fm
[Any two conclusions]
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CBSE Class 12 Physics past-paper question from the 2026 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.