32. A rod of length l and area of cross-section A is heated from
32. 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 C
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(a) – 5 J (b) – 10 J (c) – 15 J (d) – 20 J Answer-a