question_answer

The pressure that has to be applied to the ends of a steel wire of length 10 cm to keep its length constant when its temperature is raised by 100°C is:                                                                                                [JEE MAIN 2014] (For steel Young’s modulus is \[2\times {{10}^{11}}N{{m}^{-2}}\]and coefficient of thermal expansion is  \[1.1\times {{10}^{-5}}{{K}^{-1}}\])

A)  \[2.2\times {{10}^{7}}Pa\]

B)                   \[2.2\times {{10}^{6}}Pa\]

C)  \[2.2\times {{10}^{8}}Pa\]      

D)       \[2.2\times {{10}^{9}}Pa\]

Correct Answer: C

Solution :

[c]