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The length of a metal rod at `0^(@)C` is `0.5m` When it sis heated, its length incerases by `2.7mm`. The final temperature of rod is (coeff. Of linear excpansion of metal `= 90 xx 10^(-6//@)C`)A. `20^(@)C`B. `30^(@)C`C. `40^(@)C`D. `60^(@)C`

Answer» Correct Answer - D
`t_(2) - t_(1) = (l_(2) - l_(1))/(l_(1)alpha)`


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