A copper rod of 88 cm and an aluminium rod of unknown length have their increase in length independent of increase in temperature. The length of aluminium rod is : (\(\alpha_{Cu} \)= 1.7 × 10–5 K–1 and (\(\alpha_{Al}\) = 2.2 × 10–5 K–1)
Answer & explanation
Correct answer: option 1
\(\alpha_{Cu} L_{Cu}\) = \(\alpha_{Al} L_{Al}\)
\(\alpha_Cu \)= 1.7 × 10–5 K–1 ; (\(\alpha _{Al} \) = 2.2 × 10–5 K–1
\(L_{Cu}\) = 88 cm
\(L_{Al}\) = 68 cm