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A horizontal tube has different cross-se...

A horizontal tube has different cross-sectional areas at point A and B .The diameter of A is 4 cm and that of Bis 2 cm. Two manometer limbs are attached at A and B. When a liquid of density 8.0 g `cm^(-3)` flows through the tube, the pressure difference between the limbs of the manometer is 8 cm. Calculate the rate of flow of the liquid in the tube .

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