Q. The graph shows the behaviour of a length of wire in the region for which the substance obeys Hooke’s law. $P$ and $Q$ represent
A) $P =$ applied force, $Q =$ extension
B) $P =$ extension, $Q =$ applied force
C) $P =$ extension, $Q =$ stored elastic energy
D) $P =$ stored elastic energy, $Q =$ extension
Explanation
(c) Graph between applied force and extension will be straight line because in elastic range
Applied force $\propto$ extension
But the graph between extension and stored elastic energy will be parabolic in nature
As $U = 1/2\ kx^{2}$ or $U \propto x^{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.