An iron bar whose cross sectional area is 4cm² is heated from 0°C and 100°C. The force required…

Q: An iron bar whose cross sectional area is 4cm² is heated from 0°C and 100°C. The force required to prevent the expansion of the rod is [Y of Iron = 2 × 1012 dyne/cm² ,  α of Iron = 12 × 10-6 /°C ]

(a) 0.96 × 108 N

(b) 0.96 × 107 N

(c) 9.6 ×107 N

(d) 96 ×103 N

Ans: (d)