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  4. The potential energy of a particle varies with distance x as shown in the graph. <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/199389a73776ed783439c8db311c977c-.png /> The force acting on the particle is zero at

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Q. The potential energy of a particle varies with distance x as shown in the graph.
image
The force acting on the particle is zero at

Work, Energy and Power

Solution:

$F=\frac{-d U}{d x}$ it is clear that slope of $U-x$ curve is zero at point $B$ and $C.$
$\therefore F=0$ for point $B$ and $C$