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A cylindrical rod of length 1 m and radius 4 cm is mounted vertically. It is subjected to a shear force of 10 5 N at the top. Considering infinitesimally small displacement in the upper edge, the angular displacement  of the rod axis from its original position would be (shear moduli, G = 10 10 N/m 2 )

1. 1 4 
2. 1 40 
3. 1 2 
4. 1 160 

Correct answer: 1 160 

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