Young's modulus for perfectly rigid body is

Young's modulus for perfectly rigid body is
  1. zero
  2. infinite
  3. $1 \times 10^{10} \mathrm{Nm}^{-2}$
  4. $10 \times 10^{10} \mathrm{Nm}^{-2}$

Solution

In perfectly rigid body, there is no change in its dimensions on applying a deforming force, therefore strain in the perfectly rigid body is zero. $\therefore$ Young's modulus $=\frac{\text { Stress }}{\text { Strain }}=\frac{\text { Stress }}{0}=\infty$ Therefore, Young's modulus of a perfectly rigid body is infinite.

Asked in: AP EAMCET 2020 (22 Sep Shift 2)

Practice more Mechanical Properties of Solids questions on Aicharya