Solve this :

 11. An iron rod of length 100 cm and 10 cm2 cross-section is heated from 0oC to 100o If it is not allowed to bend or expand, what force is developed in it ? Given that Y -1012dyne/cm2 and a = 10-5/oC.
(a) 108 dyne 
(b) 109 dyne
(c) 1010 dyne
(d) 1011 dyne

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