The potential energy U between two molecules as a function of the distance X between them has been shown in the figure. The two molecules are

Attracted when x lies between A and B and are repelled when x lies between B and C

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Attracted when x lies between B and C and are repelled when x lies between A and B

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Attracted when they reach B

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Repelled when they reach B

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Solution

The correct option is B
Attracted when x lies between B and C and are repelled when x lies between A and B

$F = - (\frac{d U}{d x})$ $\Rightarrow F =$ - slope of $U - x$ graph.

In the region BC slope of the graph is positive $\Rightarrow$ Force is negative $\Rightarrow$ attraction.

In the region AB slope of the graph is negative $\Rightarrow$ Force is positive $\Rightarrow$ repulsion.

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