A steel beam of length 5 m is heated to a temperature difference of 50 degrees. calculate (a) stress developed in the beam when both ends are fixed and (b) change in length when one end is free to expand (a¸ =11.7×10°/°C, E = 210 MPa). (A) (a)σ =112.85 MPa (b) 5=0.002925 m (B) (a)σ =225.7 MPa (b) 5=0.02925 m (C) (a)σ =112.85 MPa (b) = 2.925 m (D) (a)σ =112.85 MPa (b) 5= 0.002925 mm