The coefficient of linear expansions of brass and steel are ????₁ and ????₂
respectively. When we take a brass rod of length ℓ₁ and a steel rod of
length ℓ₂ at 0ºC, then the difference in their lengths (ℓ₂ – ℓ₁) will
remain the same at all temperatures if
(a) ????₁ ℓ₁ = ????₂ ℓ₂ (b) ????₁ ℓ₂ = ????₂ ℓ₁
(c) ????₁² ℓ₂ = ????₂² ℓ₁ (d) ????₁ ℓ₂² = ????₂ ℓ₁²
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Hello mate ♥
the second option is correct
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