The potential energy U between two molecules | vedclass

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(B) The force $F$ between two molecules is related to the potential energy $U$ by the relation $F = -\frac{dU}{dx}$.In the region $BC$,the slope of th

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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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(B) The force $F$ between two molecules is related to the potential energy $U$ by the relation $F = -\frac{dU}{dx}$.In the region $BC$,the slope of the graph $\frac{dU}{dx}$ is positive.Therefore,$F = -(	ext{positive}) = 	ext{negative}$,which means the force is attractive in nature.In the region $AB$,the slope of the graph $\frac{dU}{dx}$ is negative.Therefore,$F = -(	ext{negative}) = 	ext{positive}$,which means the force is repulsive in nature.Thus,the molecules are attracted when $x$ lies between $B$ and $C$ and are repelled when $X$ lies between $A$ and $B$.

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

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