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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

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Attracted when X lies between B and C and are repelled when X lies between A and B.

Repelled when they reach B.

Attracted when they reach B.

Attracted when X lies between A and B and are repelled when X lies between B and C.

answer is B.

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Detailed Solution

$F = - (\frac{dU}{dx})$ .

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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