Question

Two capillary tubes $A$ and $B$ are arranged in parallel. A liquid flows through these capillary tubes under the same pressure head. Both the tubes have to same length The radii of $A$ and $B$ are $r$ and $\frac{r}{2}$ respectively. If the rate of flow of liquid through $A$ is $8{cm}^3/s$ , then the rate of flow through the combination of $A$ and $B$ is

• A. $16{cm}^3/s$
• B. $8.0{cm}^3/s$
• C. $12.75{cm}^3/s$
• D. $8.5{cm}^3/s$

Answer 1

The correct option is D $8.5{cm}^3/s$

The rate of flow through the combination of $A$ and $B$ is $8.5c{m}^3/s$.

Hence,

Option $D$ is correct answer.