Question

The graph shows the behavior of a length of wire in the region for which the substance obey's Hooke's law. P & 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

Answer 1

Correct option: (C) P = extension, Q = stored elastic energy

Explanation:

(1) Graph between, Force & extension will be straight line as in elastic range Force α extension.

(2) stored energy = U = (1/2) Kx²           i.e.      U ∝ x² 

i.e. graph between stored elastic energy and extension will be parabolic in nature