The rate of steady volume flow of water through a capillary tube of length 'l' and radius 'r' under a pressure difference of P is V. This tube is connected with another tube of the same length but half the radius in series. Then the rate of steady volume flow through them is (The pressure difference across the combination is P)
Rate of flow of liquid V=PR
where liquid resistance R=8 nlπr4
For another tube liquid resistance
R′=8nlπ(r2)4=8nlπr4.16=16R
For the series combination
VNEW=PR+R′=PR+16R=P17R=V17