A thin brass sheet at 20°C and a thin steel sheet at 30°C have the same surface area. The common temperature at which both would have the same area is (Coefficient of linear expansion for brass and steel are respectively, 19 × 10–6/°C are 11 × 10–6/°C)

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–6.25°C

+6.25°C

–3.25°C

+3.25°C

answer is B.

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Detailed Solution

A2brass =A2steel A1br1+bBr(t−20)=A1st1+bSt(t−30) Given A1br=A1st

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