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.

Explanation

To solve the question, we need to draw a plot of the potential energy of a pair of nucleons as a function of their separation. We will also identify the regions of attractive and repulsive nuclear forces and mention two characteristic features of nuclear forces.

### Step-by-Step Solution:

1. **Understanding the Concept**:
- The potential energy (U) of a pair of nucleons depends on their separation distance (r). As nucleons come closer, the potential energy changes due to the nuclear forces acting between them.

2. **Setting Up the Axes**:
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