Question

Two narrow capillary tubes A and B are of lengths ( and 111 and of same radius r. The rate of flow of water through the tube A under a constant pressure head P is 3 $\sqrt{\text{49}0}\text{ m}/\text{s}$ . If A and B are connected in series and the same pressure difference P is maintained between the ends of the composite tube, then the rate of flow of water is :

• A. $\sqrt{\text{4}\text{.9}}\text{ m}/\text{s}$
• B. $8\sqrt{3}$
• C. $2\sqrt{3}cm$
• D. none of these

Answer 1

Answer: (C)

$2\sqrt{3}cm$

Answer 2

For tube $1:\sqrt{3}$ $7.9\times {{10}^{4}}K$ For the composite tube $3.5\times {{10}^{4}}K$ $5.8\times {{10}^{4}}K$