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a metre scale made of steel is calibrated at 20 degree celsius to give correct reading .find the distance between 50cm mark and 51 cm mark if the scale is used at 10 degree celsius. alpha of steel is 1.1 X 10 --5 per degree celsius. The answer given in the book is 1.00011 cm. (Ref; Verma's book, vol II, heat and temp.problem 11) But how can there be expansion when steel is cooled?I think the answer should be 0.99989 cm.
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