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Three capillaries of length L, (L)/(2) a...

Three capillaries of length `L, (L)/(2) and (L)/(3)` are connected in a series. Their radii are `r, (r)/(2) and (r)/(3)` respectively. If a streamlined flow is to be maintained and pressure difference across the first capillary is `rho`, then the pressure difference across the second capillary will be

A

`2 rho`

B

`8 rho`

C

`rho`

D

`(rho)/(2)`

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The correct Answer is:
B
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