The given plot shows the variation of U, the potential energy of interaction between two particles, with the distance separating them, r :

- C is a point of stable equilibrium
- The force of interaction between the two particles is attractive between points C and D and repulsive between points D and E on the curve.
- B and D are equilibrium points
- The force of interaction between the particles is repulsive between points E and F on the curve. y-interaction-between-particles-distance-separating
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