WB JEE 2017 | Properties of Matter Question 21 | Physics

WB JEE 2017

MCQ (Single Correct Answer)

-0.25

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, $$\alpha$$₂t < <1)

$${{{\alpha _1} + {\alpha _2}} \over 2}$$

$$2({\alpha _1} + {\alpha _2})$$

$${{4{\alpha _1}{\alpha _2}} \over {{\alpha _1} + {\alpha _2}}}$$

$${\alpha _1} + {\alpha _2}$$

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