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Question

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

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A
Attracted when x lies between A and B and are repelled when X lies between B and C
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B
Attracted when x lies between B and C and are repelled when X lies between A and B
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C
Attracted when they reach B
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D
Repelled when they reach B
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Solution

The correct option is D Attracted when x lies between B and C and are repelled when X lies between A and B
F=(dUdx).
In the region BC slope of the graph is positive
F=negative i.e. force is attractive in nature
In the region AB slope of the graph is negative
F=positive i.e. force is repulsive in nature

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