Q1

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} } } } } {}