Question

An iron rod is 1.58 metre long at 0 degree Celsius, what must be the length of a brass rod at 0 degree Celsius if the difference between the lengths of the two rods is to remain the same at all temperatures.
Linear expansivity of iron = 1.2X10^-5 K^-1
Linear expansivity of brass = 1.9X10^-5 K^-5
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