Q. The potential energy of a conservative system is given by $V(x) = \left( x^{2} - 3x \right)\ joule$. Then its equilibrium position is at

A) $x = 1.5\ m$
B) $x = 2m$
C) $x = 2.5\ m$
D) $x = 3\ m$
Explanation

(a) $V(x) = \left( x^{2} - 3x \right)\ J$
For a conservation field. Force, $F = - \frac{dV}{dx}$
$\therefore F = - \frac{d}{dx}\left( x^{2} - 3x \right) = - (2x - 3) = - 2x + 3$
At equilibrium position, $F = 0$
$- 2x + 3 = 0$
$x = \frac{3}{2}m = 1.5\ m$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.