question_answer

The length of a metal rod at \[0{}^\circ C\] is 0.5 m. When it is heated, its length increases by 2.7mm. The final temperature of the rod is: (Coefficient of linear expansion of the metal\[=90\times {{10}^{-6}}/{}^\circ C\])

A) \[20{}^\circ C\]

B) \[30{}^\circ C\]

C) \[40{}^\circ C\]

D) \[60{}^\circ C\]