A) \[8\times {{10}^{-7}}rad\]
B) \[7\times {{10}^{-7}}rad\]
C) \[6\times {{10}^{-6}}rad\]
D) \[5\times {{10}^{-5}}ra\]
Correct Answer: A
Solution :
[a] Shear stress \[=\frac{F}{A}\] \[\tan \theta =\frac{shear\,stress}{shear\,\bmod ulus}\] \[\Rightarrow \tan \theta =\frac{4000}{{{(0.25)}^{2}}\times 8\times {{10}^{10}}}\] \[\tan \theta =8\times {{10}^{-7}}\] for small angle \[\tan \theta =\theta =8\times {{10}^{-7}}rad\]
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