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[" The rate of flow of liquid in a tube of radius "I" ,length "l],[" whose ends are maintained at a pressure difference "p" is "],[V=(pi Qpr^(4))/(n ell)" ,where "eta" is coefficient of the viscosity and "Q],[" is: "],[[" (a) "8," (b) "1/8],[" (c) "16," (d) "1/16]]

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