Question

A brass rod of length $1\text{m}$ is fixed to a vertical wall at one end, with the other end kept free to expand. When the temperature of the rod increases by ${120}^{\circ }\text{C}$, the length increases by $3\text{cm}$. What is the strain?

• A. $0.5$
• B. $0.005$
• C. $0.05$
• D. $0$

Answer 1

The correct option is D $0$

After the increase of ${120}^{\circ }\text{C}$, temperature remains constant.
$\therefore$ No tensile force and no internal force developed in the rod.

So, strain $=0$.