A solid rectangular sheet has two different coefficients of linear expansion \alpha_1 and \alpha_2 along its length and breadth respectively. The coefficient of surface expansion is (for \alpha_1 t ≪ 1, \alpha_2 t ≪ 1)

\frac{4\alpha_1\alpha_2}{\alpha_1+\alpha_2}

WBJEE 2017 Physics Solved Paper

Question : 7 of 40

Marks: +1, -0

A solid rectangular sheet has two different coefficients of linear expansion α1 and α2 along its length and breadth respectively. The coefficient of surface expansion is (for α1 t ≪ 1, α2 t ≪ 1)

α1+α2
2
2(α1+α2)
4α1α2
α1+α2
α1+α2

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