. The design of a physical instrument requires that there be a constant difference
in length of 10 cm between an iron rod and a copper cylinder laid side by side at all temperatures. If 
their lengths are
A. 28.3 cm, 18.3 cm
B. 23.8 cm, 13.8 cm
C. 23.9 cm, 13.9 cm
D. 27.5 cm, 17.5 cm
Best Answer
Ans: Since a constant difference in length of 10 cm between an iron rod and a copper cylinder is required therefore
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