Question

The graph shows the behaviour of a steel wire in the region for which the wire obeys Hooke's law.The graph is a part of a parabola. The variables x and y might represent.

• A. x $=$ stress ; y $=$ strain
• B. x $=$ strain ; y $=$ stress
• C. x $=$ strain ; y $=$ elastic energy
• D. x $=$ elastic energy ; y $=$ strain

Answer 1

Answer: (D)

x $=$ elastic energy ; y $=$ strain

Elastic energy $=\frac{1}{2}\times stress\times strain$
whereas strain deals with change in length / original length
hence, "x' axis depends on depended variable but "y" axis depends on independant variable. So, option "D" is correct.