Question

The upper end of wire of radius $4mm$ and length $100cm$ is clamped and its lower end is twisted through an angle of ${30}^0.$ The angle of shear is$:$

• A. ${18}^{\circ }$
• B. ${36}^{\circ }$
• C. ${0.12}^{\circ }$
• D. ${0.36}^{\circ }$

Answer 1

The correct option is C ${0.12}^{\circ }$

$l\varphi =r\theta$

$1\times \varphi =4\times {10}^{-3}\times {30}^0$

$\varphi ={0.12}^0$

Hence,

option $\left(C\right)$ is correct answer.