A square hole of side length $l$ is made at a depth of $h$ and a circular hole of radius $r$ is made at a depth of $4\,h$ from the surface of water in a water tank kept on a horizontal surface. If $l << h,\,r << h$ and the rate of water flow from the holes is the same, then $r$ is equal to
A square hole of side length $l$ is made at a depth of $h$ and a circular hole of radius $r$ is made at a depth of $4\,h$ from the surface of water in a water tank kept on a horizontal surface. If $l << h,\,r << h$ and the rate of water flow from the holes is the same, then $r$ is equal to
- A
$\frac{l}{{\sqrt {2\pi } }}$
- B
$\frac{l}{{\sqrt {3\pi } }}$
- C
$\frac{l}{{{3\pi } }}$
- D
$\frac{l}{{{2\pi } }}$
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