Question

A rod of length l and area of cross-section A is heated from 0°C to 100°C. The rod is so placed that it is not allowed to increase in length, then the force developed is proportional to

• A. l
• B. $l ^ { - 1 }$
• C. A
• D. $A ^ { - 1 }$

Answer 1

Answer: (C)

A

Answer 2

$F = Y A \alpha \Delta \theta \therefore F \propto A$