Which of the following relationship is valid for the equilibrium position of the float in a Rotameter? (Where, Df= Drag force on the float Bf = Buoyant force on the float Wf = Weight of the float)?

A. Df + Bf + Wf =0

B. Df + Bf = Wf

C. None of these

D. Df = Bf + Wf

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