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The viscous resistance of a tube to liqu...

The viscous resistance of a tube to liquid flow is R. its resistance for a narrow tube of same length and `(1)/(3)` times radius is

A

`(R)/(3)`

B

`3R`

C

`27R`

D

`81R`

Text Solution

Verified by Experts

The correct Answer is:
D
`R=(8etal)/(pir^(4)),Ralpha(1)/(r^(4))`
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