A square hole of side length i is made at a depth of h and a circular hole of radius r is made at a depth of 4h from the surface of water in a water tank kept on a horizontal surface. If \[\ell <<h,r<<h\]and the rate of water flow from the holes is the same, then r is equal to [JEE ONLINE 07-05-2012] |
A) \[\frac{\ell }{\sqrt{2\pi }}\]
B) \[\frac{\ell }{\sqrt{3\pi }}\]
C) \[\frac{\ell }{3\pi }\]
D) \[\frac{\ell }{2\pi }\]
Correct Answer: A
Solution :
[a] As(Principle of continuity) |
or, |
(Efflux velocity ) |
or |
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