Under a constant pressure head, the rate of flow of liquid through a capillary tube is $V$. If the length of the capillary is doubled and the diameter of the bore is halved, the rate of flow would become
A$V / 4$
B$16 V$
C$V / 8$
D$V / 32$
Medium
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D$V / 32$
d (d) Rate of flow under a constant pressure head,
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