Draw a plot of potential energy of a pair of nucleons as a function of their separations. Mark the regions where the nuclear force is (i) attractive and (ii) repulsive. Write any two characteristic features of nuclear forces.
OR
Draw a plot of potential energy of a pair of nucleons as a function of their separation. Write two important conclusions which you can draw regarding the nature of nuclear forces.

Explanation

(i) For r `lt` OB, repulsive
(ii) For r `gt` OB force is attractive
OR
Nuclear forces are
1. Very strong
2. Charge independent
3. Show saturation
4. Spin dependent