A bar of iron is 10 cm at 20°C . At 19°C it will be

Q: A bar of iron is 10 cm at 20°C. At 19°C it will be (α of iron = 11 × 10-6/°C)

(a) 11 × 10-6 cm longer

(b) 11 × 10-6 cm shorter

(c) 11 × 10-5 cm shorter

(d) 11 × 10-5 cm longer

Click to See Answer :
Ans: (c)