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^@`. Then angle of shear is

The upper end of a wire of radius 4mm & length 100 cm is clamped and its other rend is twisted through an angle of 30^(@) the angle of shear is.

The upper end of a wire of diameter 12mm and length 1m is clamped and its other end is twisted through an angle of 30^(@) . The angle of shear is

The upper end of a wire of radius 4mm and lengh 100cm is clamped and its other end if twiced through an angle of 60^(@) the angle of shear si

The upper end of a wire 1 meter long and 2 mm radius is clamped. The lower end is twisted through an angle of 45^(@) . The angle of shear is

Find the elastic deformation energy of a steel rod whose one end is fixed and the other is twisted through an angle varphi=6.0^@ . The length of the rod is equal to l=1.0m , and the radius to r=10mm .