Again thermal expansion

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Two rods of length L₂ and coefficient of linear expansion Î±₂ are connected freely to a third rod of length L₁and coefficient of linear expansion Î±₁ to form an isosceles triangle.The arrangement is supported on a knife edge at the middle point of L₁ which is horizontal.The apex of the isosceles triangle is to remain at a constant distance from the knife edge if
(A) L₁/L₂ = Î±_₂/Î±₁
(B) L₁/L₂ = √(Î±_₂/Î±₁)
(C) L₁/L₂ = 2 Î±_₂/Î±₁
(D) L₁/L₂ = 2√(Î±_₂/Î±₁)

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Again thermal expansion

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