First slide

Potential energy

Question

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

Moderate

A

C
B

B
C

B and C
D

A and D

Solution

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

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