• # question_answer The potential energy of a particle varies with distance$x$as shown in the graph the force acting on the particle is zero at A)  C                               B)  B                    C)  B and C         D)    A and D

$F=-\frac{dU}{dx}$It is clear the slope of $U-x$curve is zero at point B and C Therefore, $F=0$for point B and C. Hence, the correction option is (c).