An incompressible fluid flows steadily through a cylindrical pipe which has radius $2r$ at point $A $ and radius $r $ at $B $ further along the flow direction. If the velocity at point $A$ is $v, $ its velocity at point $B$ is
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(d) From equation of continuity volume of water entering per second at $\mathrm{A}=$ volume of water exiting per second from $B$
Let $v$ be the velocity at point $B$, then
$\pi(2 R)^{2} v=\pi\left(R^{2}\right) v^{\prime}$
$v^{\prime}=4 v$
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