We have two (narrow) capillary tubes T a...

We have two (narrow) capillary tubes T and T . Their lengths are l and l and radii of cross-section are r and r respectively. The rate of flow of water under a pressure difference P through tube T is `8 cm 3// sec`. If `l = 2l` and `r = r` what will be the rate of flow when the two tubes are connected in series and pressure difference across the combinatin is same as before `(= P)`

`4 cm^3s^(-1)`

`16/3cm^3s^(-1)`

`8/17cm^3s^(-1)`

`8 cm^3s^(-1)`

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