The table gives the initial length ℓ 0 , change in temperature Δ T and change in length Δ ℓ of four rods. Which rod has greatest coefficient of linear expansion. Rod ℓ 0 ( m ) Δ T ( ∘ C ) Δ ℓ 0

Question

The table gives the initial length ℓ 0 ​ , change in temperature Δ T and change in length Δ ℓ of four rods. Which rod has greatest coefficient of linear expansion. Rod ℓ 0 ​ ( m ) Δ T ( ∘ C ) Δ ℓ 0 ​ (m) A1 1 100 1 A2 1 100 2 A3 1.5 50 3 A4 2.5 20 4

TestHub · Accepted Answer

​ α 1 ​ = ℓ 0 ​ Δ T Δ ℓ ​ = 1 × 100 1 × 1 0 − 3 ​ = 1 0 − 5 , α 2 ​ = 1 × 100 2 × 1 0 − 3 ​ = 2 × 1 0 − 5 ​ α 3 ​ = 1.5 × 50 3 × 1 0 − 3 ​ = 4 × 1 0 − 5 , α 4 ​ = 2.5 × 20 4 × 1 0 − 3 ​ = 8 × 1 0 − 5 ​

Physics - Heat & Thermo Question with Solution | TestHub

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Doubts & Discussion

Rod	$ℓ_{0} (m)$	$Δ T (^{\circ} C)$	$Δ ℓ_{0}$ (m)
A1	1	100	1
A2	1	100	2
A3	1.5	50	3
A4	2.5	20	4