Q. Two tubes $A\ and\ B$ are in series. Radius of $A\ is\ R$ and that of $B\ is\ 2R$. If water flows through $A$ with velocity then velocity of water through $B\ $is

A) $\frac{v}{2}$
B) $v$
C) $\frac{v}{4}$
D) $\frac{v}{8}$
Explanation

(c) Form principle of continuity
$A_{1}v_{1} = A_{2}v_{2}$
$\pi R^{2} \bullet v = \pi(2R)^{2} \bullet v_{2}$
$v_{2} = \frac{v}{4}$

Dr. Abubacker
Reviewed by Dr. Abubacker

Physics Educator & NEET/JEE Specialist

Ph.D. in Physics with 19+ years of teaching experience.