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Question

A small uniform tube is bent into a circular tube of radius R and kept in the vertical plane. Equal volume of two liquids of densities ρ and σ (ρ>σ) fill half of the tube as shown . θ is the angle which the radius passing through the interface makes with the vertical. Then

A
θ = tan1(ρ σρ + σ)
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B
θ = tan1(σ ρρ + σ)
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C
θ = tan1(ρ ρ + σ)
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D
θ = tan1(ρ ρ σ)
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Solution

The correct option is A θ = tan1(ρ σρ + σ)
Pressure at A from both side must balance. Figure is self-explanatory.
σh2g = ρh1gσ R2sin(45 + θ) = ρR(cosθ sinθ]σ (cosθ + sinθ] = ρ(cosθ sinθ]tanθ = ρ σρ + σ

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