Steel bars each of length 3m at 28°C are to be used for constructing a rail line. If the linear expansitivity of the steel is 1 x \(10^{-5}K^{-1}\),what is the safety gap that must be left between the successive bars if the highest temperature expected is 40°C?
A. 1.2x \(10^{-1}cm\) B. 7.2x\(10^{-1}cm\) C. 6x\(10^{-1}cm\) D. 3.6x\(10^{-1}cm\) E. 1.8x\(10^{-1}cm\)
