Question

A copper rod $2\text{m}$ long is stretched by $1\text{mm}$. Then, strain will be -

• A. ${10}^{-4}$, volumetric
• B. $5\times {10}^{-4}$, volumetric
• C. $5\times {10}^{-4}$, longitudinal
• D. $5\times {10}^{-3}$, volumetric

Answer 1

The correct option is C $5\times {10}^{-4}$, longitudinal

Strain $=\frac{\Delta l}{l}=\frac{1\times {10}^{-3}}{2}=5\times {10}^{-4}$, longitudinal ($\because$ Rod is deforming in only one direction)