Question

Water flows through a capillary tube at the rate of 10 cc per minute. If the pressure difference across the same tube is doubled, the rate of flow of water through the tube will be ( in cc per minute):

• A. 20
• B. 5
• C. 40
• D. 2.5

Answer 1

Answer: (A)

20

Looking a poiseulli's eqn we find,
$Q=\alpha p$
$Q=kp$
$\therefore$If the pressure difference is double, the rate of flow will also be double.
So,
$Q=20cc/min$