1.

The upper end of a wire of radius 4 mm and length 100 cm is clamped and its other end is twisted through an angle of\[30{}^\circ \]. Then angle of shear is    [NCERT 1990; MP PMT 1996]

A.                 \[12{}^\circ \]      
B.                 \[0.12{}^\circ \]
C.                 \[1.2{}^\circ \]     
D.                 \[0.012{}^\circ \]
Answer» C.                 \[1.2{}^\circ \]     


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