Question

The graph shows the behavior of the length of a wire in the region for which the material obeys Hooke’s law, then $P$ 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

$F=-kx$

So, A, B are wrong.

$U=\frac{1}{2}k{x}^2$

From this Q is stored elastic energy , and P is extension.