A solid rectangular sheet has two differ...

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<<, alpha_2 t<< 1`)

`(alpha_1 + alpha_2)/2`

`2(alpha_1 + alpha_2)`

`(1alpha_1alpha_2)/(alpha_1 + alpha_2)`

`(alpha_1 + alpha_2)`

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