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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

  

 

(5)

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