Question
An iron scale is calibrated at 0∘C. The length of a zinc rod is measured to be 100 cm by the scale when the rod and the scale both are at 00C. What will be the length of the rod as measured by the scale when both are at 100∘C. Given : αiron=1.2×10−5 ∘C−1 and αzinc=2.6×10−4 ∘C−1.