A Rectangular cross section beam of width 0.25 m and depth 0.4 m is subjected to a bending moment of 200 Nm and a u information axial load of 200 N as show in below figure. Distance from top surface where normal stress will be zero is

_{see the figure below}

200 Nm 200 Nm 0.25 m 200 N -200 N 0.4 m