A helical gear with $20^{\circ}$ pressure angle and $30^{\circ}$ helix angle mounted at the mid-span of a shaft that is supported between two bearings at the ends. The nature of the stresses induced in the shaft is
- normal stress due to bending only
- normal stress due to bending in one plane and axial loading; shear stress due to torsion
- normal stress due to bending in two planes and axial loading; shear stress due to torsion
- normal stress due to bending in two planes; shear stress due to torsion