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Q. The variation of potential energy $U$ of a body moving along $x$-axis varies with its position $(x)$ as shown in figure
image
The body is in equilibrium state at

Work, Energy and Power

Solution:

at $B, \frac{d U}{d x}=0$ (Slope of $U-x$ curve)
$\Rightarrow F=0$ at $B$, So its a position of equilibrium