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Two capillary of length L and 2L and of ...

Two capillary of length L and 2L and of radius R and 2R are connected in series. The net rate of flow of fluid through them will be (given rate to the flow through single capillary,
`("X"=(pi"PR"^(4))/(8eta"L"))`

A

`8/9X`

B

`9/8X`

C

`(5)/(7)X`

D

`(7)/(5)X`

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