Question

If a cylindrical rod under goes a linear tensile strain and lateral contraction as well, which of the following quantity would be best for measurement of their ratio.
1. Bulk modulus 
2. Thermal coefficient
3. Young's modulus 
4. Poisson's ratio
5.

Answer 1

Correct Answer - Option 4 : Poisson's ratio

Correct option - 4

Concept:

Poisson’s ratio

It is the ratio of lateral or transverse strain to that of longitudinal strain

It is denoted by \(\sigma\)

\(\sigma\) = lateral strain/longitudinal strain

\(\sigma\) = -E/l

The negative sign indicates that if lateral stain increases the longitudinal strain gets decreases and vice-versa.

Explanation:

According to the question, we have given both tensile and lateral contraction.

So, the quantity which measures the ratio of lateral contraction to that of tensile strain is Poisson's ratio.

Therefore out of the given options, option - 4 is correct