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

• A. C
• B. B
• C. B and C
• D. A and D

Answer 1

Answer: (C)

B and C

The force acting on the particle will be zero at the point where slope of the energy graph is zero.

$F=\frac{-dU}{dx}$

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