In order to have exactly zero tensile stress at one extreme fibre of a solid circular section (dia - D) subjected to combined direct (compressive) and bending stresses, a normal point load is needed to be placed __________.
1
beyond a distance of 3D/8 measured towards the core from the periphery
2
at a radial distance D/3 from the centre
3
at a radial distance D/6 from the centre
4
at a radial distance D/4 from the centre