17. After the change in temperature the diameter of the steel rod is Ds= Ds0+ αsDs0ΔTand the diameter of the brass ring is Db= Db0+ bDb0ΔT, where Ds0and Db0are the original diameters, sand bare the coefficients of linear expansion, and ΔTis the change in temperature. The rod just fits through the ring if Ds= Db. This means Ds
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