A brass rod and an iron rod differ in length by 28cm at 20°C. What should be the original length of the iron rod for the difference in length to remain the same when both rods are heated to 90°C? Linear expansivity of brass=1.9×10^-5. Linear expansivity of iron=1.2×10^-5. Pls show workings.
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A brass rod and an iron rod differ in length by 28cm at 20°C. What should be the original length of...
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