Question

The graph shows the behaviour of a length of wire in the region for which the substance obeys Hook'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

Answer 1

The correct option is C P = extension, Q = stored elastic energy

c) Graph between applied force and extension will be straight line because in elastic range,
Applied force and extension
but the graph between extension and stored elastic energy will be parabolic in nature

As $U=\frac{1}{2}k{x}^{2}orU\propto x^2.$