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

1. B and D are equilibrium points

2. C is a point of stable equilibrium

3. The force of interaction between the two particles is attractive between points C and D and repulsive between point D and E on the curve

4. The force of interaction between the particles is repulsive between points E and F on the curve

Which of the above statements are correct

A. 1 and 3

B. 1 and 4

C. 2 and 4

D. 2 and 3

Ans: C

Sol: At point C, the potential energy is minimum, hence it is a point of stable equilibrium.

Also, from E to F, the slope is negative i.e. dU/dr<0

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