The potential energy U between two molecules as a function of the… - Vidyadip

MCQ

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

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

✓

Answer

Correct option: B.

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

(b) $F=-\left(\frac{d U}{d x}\right)$.In the region $B C$ slope of the graph is positive$\therefore F=$ negative i.e. force is attractive in natureIn the region $A B$ slope of the graph is negative$\therefore F=$ positive i.e. force is repulsive in nature

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