# Neutral axis in canteliver beam at support

First, I thought the neutral axis would just be the y bar which can be obtained from the centroid of the cross-section but is different. I have tried letting the net moment at the wall = 0 and the reaction force I got is 1kn * 1m. But I am kinda lost on how to continue.

The stress is the superposition of two stresses: tensile due to bending moment and tensile due to 200kN tension. $$\sigma_{bending}= m/S =\frac{1kN.1m}{(50\times 100^2)/6} =6kN.1000mm/500000mm^2 =6000N/500mm^2 = 12N/mm^2$$
$$\sigma_{tension}= 200kMN/100^2mm^2 = 20Nmm^2$$
$$[(20+12) -(20-12)]/100_{mm height}= 0.24Nm\space$$
and Neutral axis is at the height from the bottom face of $$\frac{8_N}{0.24} =33.33mm \space or\space\frac{H}{3}$$