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9. A dimensionally consistent relation for the volume of a liquid of coefficient of viscosity flowing per second through a tube of radius and length and having a pressure difference across its end, is (a)size 12{V= { {π ital "pr" rSup { size 8{4} } } over {8ηl} } } {} (b) size 12{V= { { ital "πη"l} over {8 ital "pr" rSup { size 8{4} } } } } {} (c) size 12{V= { {8pηl} over {πr rSup { size 8{4} } } } } {} (d) size 12{V= { {πpη} over {8 ital "lr" rSup { size 8{4} } } } } {}