Q: What force should be applied to the ends of steel rod of a cross sectional area 10 cm² to prevent it from elongation when heated form 273 K to 303 k ? ( α of steel 10-5 °C-1, Y = 2×1011 Nm-2)
(a) 2 × 104 N
(b) 3 ×104 N
(c) 6 ×104 N
(d) 12 ×104 N
Ans: (c)