A circular cross-sectional solid shaft is rigidly held at one end and torque is applied at the free end. Material of the shaft is isotropically elastic and homogeneous. Its circular section remains circular after loading. Plane cross-section remains plane after loading. Each cross-section rotates as if rigid. Then
1
shear stress will have the lowest value on the surface
2
shear stress will have different values on points lying on the circle of given radius
3
shear stress will be maximum at the centre of the section
4
shear stress will have the same value at the point lying on the circle of given radius