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57. Water flows in a streamlined manner through a capillary tube of radius a, the pressure difference being P and the rate of flow Q. If the radius is reduced to a/2 and the pressure increased to 2P, the rate of flow becomes

(a) 4 Q                                         (b)  Q

(c)   Q/4                                      (d) Q/8

Answer-d

(8)

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