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The length of a metal rod at 0°C is 0.5m.When it is heated, its length increases by 2.7mm. The final temperature of rod is (coeff. of linear expansion of metal = 90 × 10-6/°C)

a
20°C
b
30°C
c
40°C
d
60°C

detailed solution

Correct option is D

t2−t1=l2−l1l1a

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