PhysicsThe potential energy U between the two molecules as a function of the distance X between them is shown in figure. A,B and C are points for which X = 0.6A°, 1.2 A° and 1.8A0. At A, B,and C force between the two molecules respectively

The potential energy U between the two molecules as a function of the distance X between them is shown in figure. A,B and C are points for which X = 0.6A°, 1.2 A° and 1.8A0. At A, B,and C force between the two molecules respectively

  1. A

    Zero, attractive, repulsive 

  2. B

    attractive, zero, repulsive 

  3. C

    zero, repulsive, attractive. 

  4. D

    repulsive, zero, attractive.

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    Solution:

    From the figure,

    F=-dUdx

    The slope of the graph is positive in the region BC.

    F=negative, which means that force nature is attractive.

    The graph's slope is negative in region AB.

    F is positive, meaning that it has a repulsive force.

    Hence the correct answer is repulsive, zero, and attractive.

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