Q.

The given plot shows the variation of U, the potential energy of interaction between two particles with the distance separating them r.1. B and D are equilibrium points2. C is the point of stable equilibrium3. The force of interaction between two particles is attractive between points C and D are repulsive between D and E4. The force of interaction between particles is repulsive between points E and F. Which of the above statement are correct?

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a

1 and 2

b

1 and 4

c

2 and 4

d

2 and 3

answer is C.

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Detailed Solution

At’ C, the potential energy is minimum. So it is stable equilibrium position.F=−dUdr= -(slope of U- r graph)Negative force means attraction and positive force means repulsion.
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