The design of a physical instrument requires that there be a constant difference in length of 10cm between …

Q: The design of a physical instrument requires that there be a constant difference in length of 10cm between an iron rod and a copper cylinder laid side by side at all temperatures. If α_Fe = 11×10^-6/°C ,α_cu = 17×10^-6/°C, their lengths may be

(a) 28.3 cm , 18.3 cm

(b) 23.8 cm , 13.8 cm

(c) 23.9 cm , 10.9 cm

(d) 27.5 cm , 14.5 cm