JEE Main & Advanced Physics Elasticity Question Bank Graphical Questions

  • question_answer
    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                     [CPMT 1986, 88, 91]

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

    B)             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

    Correct Answer: B

    Solution :

                    \[F=-\left( \frac{dU}{dx} \right)\]. 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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